Search results “Asymmetric cryptography key length”

Modern day encryption is performed in two different ways. Check out http://YouTube.com/ITFreeTraining or http://itfreetraining.com for more of our always free training videos. Using the same key or using a pair of keys called the public and private keys. This video looks at how these systems work and how they can be used together to perform encryption.
Download the PDF handout
http://itfreetraining.com/Handouts/Ce...
Encryption Types
Encryption is the process of scrambling data so it cannot be read without a decryption key. Encryption prevents data being read by a 3rd party if it is intercepted by a 3rd party. The two encryption methods that are used today are symmetric and public key encryption.
Symmetric Key
Symmetric key encryption uses the same key to encrypt data as decrypt data. This is generally quite fast when compared with public key encryption. In order to protect the data, the key needs to be secured. If a 3rd party was able to gain access to the key, they could decrypt any data that was encrypt with that data. For this reason, a secure channel is required to transfer the key if you need to transfer data between two points. For example, if you encrypted data on a CD and mail it to another party, the key must also be transferred to the second party so that they can decrypt the data. This is often done using e-mail or the telephone. In a lot of cases, sending the data using one method and the key using another method is enough to protect the data as an attacker would need to get both in order to decrypt the data.
Public Key Encryption
This method of encryption uses two keys. One key is used to encrypt data and the other key is used to decrypt data. The advantage of this is that the public key can be downloaded by anyone. Anyone with the public key can encrypt data that can only be decrypted using a private key. This means the public key does not need to be secured. The private key does need to be keep in a safe place. The advantage of using such a system is the private key is not required by the other party to perform encryption. Since the private key does not need to be transferred to the second party there is no risk of the private key being intercepted by a 3rd party. Public Key encryption is slower when compared with symmetric key so it is not always suitable for every application. The math used is complex but to put it simply it uses the modulus or remainder operator. For example, if you wanted to solve X mod 5 = 2, the possible solutions would be 2, 7, 12 and so on. The private key provides additional information which allows the problem to be solved easily. The math is more complex and uses much larger numbers than this but basically public and private key encryption rely on the modulus operator to work.
Combing The Two
There are two reasons you want to combine the two. The first is that often communication will be broken into two steps. Key exchange and data exchange. For key exchange, to protect the key used in data exchange it is often encrypted using public key encryption. Although slower than symmetric key encryption, this method ensures the key cannot accessed by a 3rd party while being transferred. Since the key has been transferred using a secure channel, a symmetric key can be used for data exchange. In some cases, data exchange may be done using public key encryption. If this is the case, often the data exchange will be done using a small key size to reduce the processing time.
The second reason that both may be used is when a symmetric key is used and the key needs to be provided to multiple users. For example, if you are using encryption file system (EFS) this allows multiple users to access the same file, which includes recovery users. In order to make this possible, multiple copies of the same key are stored in the file and protected from being read by encrypting it with the public key of each user that requires access.
References
"Public-key cryptography" http://en.wikipedia.org/wiki/Public-k...
"Encryption" http://en.wikipedia.org/wiki/Encryption

Views: 506280
itfreetraining

How does public-key cryptography work? What is a private key and a public key? Why is asymmetric encryption different from symmetric encryption? I'll explain all of these in plain English!
🐦 Follow me on Twitter:
https://twitter.com/savjee
✏️ Check out my blog:
https://www.savjee.be
👍🏻 Like my Facebook page:
https://www.facebook.com/savjee

Views: 276765
Simply Explained - Savjee

https://8gwifi.org/CipherFunctions.jsp
Reference book: http://leanpub.com/crypto
Cryptographic Algorithms generally fall into one of two different categories, or are a combination of both.
Symmetric
Fast
Only provide confidentiality
Examples: DES, AES, Blowfish, RC4, RC5
Asymmetric
Large mathematical operations make it slower than symmetric algorithms
No need for out of band key distribution (public keys are public!)
Scales better since only a single key pair needed per individual
Can provide authentication and nonrepudiation
Examples: RSA, El Gamal, ECC, Diffie-Hellman
problem with symmetric key cryptography
DES (Data Encryption Standard)
64 bit key that is effectively 56 bits in strength
Actual algorithm is called DEA (Data Encryption Algorithm)
DES Modes
Electronic Code Book
Cipher Block Chaining (most commonly used for general purpose encryption)
Cipher Feedback
Output Feedback
Counter Mode (used in IPSec)
3DES
112-bit effective key length
Uses either 2 or 3 different smaller keys in one of several modes
Modes
EEE2/3
EDE2/3
AES
NIST replaced DES in 1997 with this
Uses the Rijndael algorithm
Supports key/block sizes of 128, 192, and 256 bits
Uses 10/12/14 rounds as block size increases
IDEA (International Data Encryption Algorithm)
Operates on 64 bit blocks in 8 rounds with 128 bit key
Considered stronger than DES and is used in PGP
Blowfish
64 bit block cipher with up to 448 bit key and 16 rounds
Designed by Bruce Schneier
RC4
Stream cipher with variable key size created by Ron Rivest
RC5
Another Rivest cipher
Block cipher with 32/64/128 bit blocks and keys up to 2048 bits
RC6
Beefier version of RC5 submitted as AES candidate
CAST
64 bit block cipher with keys between 40-128 bits with 12-16 rounds depending on key length
CAST-256 used 128-bit blocks and keys from 128-256 bits using 48 rounds
SAFER (Secure and Fast Encryption Routine)
Set of patent-free algorithms in 64 and 128 bit block variants
Variation used in Bluetooth
Twofish
Adapted version of Blowfish with 128 bit blocks, 128-256 bit keys and 16 rounds
AES Finalist
Kryptografie mit symmetrischem Schlüssel
symmetric key cryptography
symmetric key cryptography tutorial
symmetric key cryptography example
symmetric key cryptography vs asymmetric key cryptography
symmetric and asymmetric key cryptography
symmetric key cryptography
Kryptografie mit symmetrischem Schlüssel
Kryptographie mit symmetrischem Schlüssel
Kryptographie mit symmetrischem Schlüssel
Kryptografie mit symmetrischem Schlüssel und asymmetrische Schlüsselkryptographie
symmetrische und asymmetrische Schlüsselkryptographie
Kryptografie mit symmetrischem Schlüssel

Views: 42896
Zariga Tongy

RSA being a public key crypto-system has two keys, the Public key and the Private key. The Encryption is done using one and the decryption is done using the other. Normally, the encryption is done using the Public key and the decryption is done using the Private key. The RSA modulus (explained below) length is called the key length of the cipher. The currently largest factored prime number had 768 bit. As the security of RSA depends on the factoring problem, using a modulus of 1024 bits is a bare minimum. It is recommended to use at least 2048 bits for good security. 4096 bit is pretty much unbreakable, anything beyond 4096 bits is over the top and would also be painfully slow. #selfhostwcf, #p2pnetworkprogramming,#netcorecommerce

Views: 4609
Freelance Web Developments

This video is a sample from Skillsoft's video course catalog. After watching it, you will be able to recognize the difference between blocks and key sizes as they apply to cipher algorithms.
Dan Lachance has worked in various IT roles since 1993 including as a technical trainer with Global Knowledge, programmer, consultant, as well as an IT tech author and editor for McGraw-Hill and Wiley Publishing. He has held and still holds IT certifications in Linux, Novell, Lotus, CompTIA, and Microsoft. His specialties over the years have included networking, IT security, cloud solutions, Linux management, and configuration and troubleshooting across a wide array of Microsoft products.
Skillsoft is a pioneer in the field of learning with a long history of innovation. Skillsoft provides cloud-based learning solutions for our customers worldwide, who range from global enterprises, government and education customers to mid-sized and small businesses. Learn more at http://www.skillsoft.com.
https://www.linkedin.com/company/skillsoft
http://www.twitter.com/skillsoft
https://www.facebook.com/skillsoft

Views: 1711
Skillsoft YouTube

MIT 6.042J Mathematics for Computer Science, Spring 2015
View the complete course: http://ocw.mit.edu/6-042JS15
Instructor: Albert R. Meyer
License: Creative Commons BY-NC-SA
More information at http://ocw.mit.edu/terms
More courses at http://ocw.mit.edu

Views: 21300
MIT OpenCourseWare

cryptography
To get certificate subscribe: https://www.coursera.org/learn/cryptography
========================
Playlist URL: https://www.youtube.com/playlist?list=PL2jykFOD1AWb07OLBdFI2QIHvPo3aTTeu
============================
Youtube channel: https://www.youtube.com/user/intrigano
============================
https://scsa.ge/en/online-courses/
https://www.facebook.com/cyberassociation/

Views: 6583
intrigano

This is part 11 of the Blockchain tutorial explaining how the generate a public private key using Elliptic Curve.
In this video series different topics will be explained which will help you to understand blockchain.
Bitcoin released as open source software in 2009 is a cryptocurrency invented by Satoshi Nakamoto (unidentified person or group of persons).
After the introduction of Bitcoin many Bitcoin alternatives were created. These alternate cryptocurrencies are called Altcoins (Litecoin, Dodgecoin etc).
Bitcoin's underlying technology is called Blockchain.
The Blockchain is a distributed decentralized incorruptible database (ledger) that records blocks of digital information. Each block contains a timestamp and a link to a previous block.
Soon people realises that there many other use cases where the Blockchain technology can be applied and not just as a cryptocurrency application.
New Blockchain platforms were created based on the Blockchain technology, one of which is called Ethereum.
Ethereum focuses on running programming code, called smart contracts, on any decentralized application.
Using the new Blockchain platforms, Blockchain technology can be used in supply chain management, healthcare, real estate, identity management, voting, internet of things, etcetera, just to name a few.
Today there is a growing interest in Blockchain not only in the financial sector but also in other sectors.
Explaining how Blockchain works is not easy and for many the Blockchain technology remains an elusive concept.
This video series tries to explain Blockchain to a large audience but from the bottom up.
Keywords often used in Blockchain conversation will be explained.
Each Blockchain video is short and to the point.
It is recommended to watch each video sequentially as I may refer to certain Blockchain topics explained earlier.
Check out all my other Blockchain tutorial videos
https://goo.gl/aMTFHU
Subscribe to my YouTube channel
https://goo.gl/61NFzK
The presentation used in this video tutorial can be found at:
http://www.mobilefish.com/developer/blockchain/blockchain_quickguide_tutorial.html
The presentation used in this video tutorial can be found at:
http://www.mobilefish.com/developer/blockchain/blockchain_quickguide_tutorial.html
The python script used in the video:
https://www.mobilefish.com/download/cryptocurrency/bitcoin_ec_key_generation.py.txt
Cryptocurrency address generator and validator:
https://www.mobilefish.com/services/cryptocurrency/cryptocurrency.html
Desmos graph:
https://www.desmos.com/calculator/kkj2efqk5x
James D'Angelo, Bitcoin 101 Elliptic Curve Cryptography Part 4:
https://youtu.be/iB3HcPgm_FI
#mobilefish #blockchain #bitcoin #cryptocurrency #ethereum

Views: 20067
Mobilefish.com

This video is part of an online course, Applied Cryptography. Check out the course here: https://www.udacity.com/course/cs387.

Views: 4482
Udacity

Security+ Training Course Index: http://professormesser.link/sy0401
Professor Messer’s Course Notes: http://professormesser.link/sy0401cn
Frequently Asked Questions: http://professormesser.link/faq
- - - - -
Our encryption methods will generally use either symmetric encryption or asymmetric encryption, and sometimes both! In this video, you’ll learn the advantages and disadvantages when using symmetric or asymmetric encryption types.
- - - - -
Download entire video course: http://professormesser.link/401adyt
Get the course on MP3 audio: http://professormesser.link/401vdyt
Subscribe to get the latest videos: http://professormesser.link/yt
Calendar of live events: http://www.professormesser.com/calendar/
FOLLOW PROFESSOR MESSER:
Professor Messer official website: http://www.professormesser.com/
Twitter: http://www.professormesser.com/twitter
Facebook: http://www.professormesser.com/facebook
Instagram: http://www.professormesser.com/instagram
Google +: http://www.professormesser.com/googleplus

Views: 68321
Professor Messer

Using the greatest common divisor (GCD) to factorize the public modulo into the secret primes, so we can forge a RSA signature.
Source for the rhme2 challenges: https://github.com/Riscure/Rhme-2016
-=[ 🔴 Stuff I use ]=-
→ Microphone:* https://amzn.to/2LW6ldx
→ Graphics tablet:* https://amzn.to/2C8djYj
→ Camera#1 for streaming:* https://amzn.to/2SJ66VM
→ Lens for streaming:* https://amzn.to/2CdG31I
→ Connect Camera#1 to PC:* https://amzn.to/2VDRhWj
→ Camera#2 for electronics:* https://amzn.to/2LWxehv
→ Lens for macro shots:* https://amzn.to/2C5tXrw
→ Keyboard:* https://amzn.to/2LZgCFD
→ Headphones:* https://amzn.to/2M2KhxW
-=[ ❤️ Support ]=-
→ per Video: https://www.patreon.com/join/liveoverflow
→ per Month: https://www.youtube.com/channel/UClcE-kVhqyiHCcjYwcpfj9w/join
-=[ 🐕 Social ]=-
→ Twitter: https://twitter.com/LiveOverflow/
→ Website: https://liveoverflow.com/
→ Subreddit: https://www.reddit.com/r/LiveOverflow/
→ Facebook: https://www.facebook.com/LiveOverflow/
-=[ 📄 P.S. ]=-
All links with "*" are affiliate links.
LiveOverflow / Security Flag GmbH is part of the Amazon Affiliate Partner Programm.
#CTF #Cryptography

Views: 48122
LiveOverflow

What is Hashing & Digital Signature in The Blockchain? https://blockgeeks.com/
Today, we're going to be talking about the word blockchain and breaking it down to understand what does it mean when someone says, "Blockchain."
What is hashing? Hashing refers to the concept of taking an arbitrary amount of input data, applying some algorithm to it, and generating a fixed-size output data called the hash. The input can be any number of bits that could represent a single character, an MP3 file, an entire novel, a spreadsheet of your banking history, or even the entire Internet. The point is that the input can be infinitely big. The hashing algorithm [00:01:00] can be chosen depending on your needs and there are many publicly available hashing algorithms. The point is that the algorithm takes the infinite input of bits, applies some calculations to them, and outputs a finite number of bits. For example, 256 bits.
What can this hash be used for? A common usage for hashes today is to fingerprint files, also known as check zones. This means that a hash is used to verify that a file has not been [00:01:30] tampered with or modified in any way not intended by the author. If WikiLeaks, for example, publishes a set of files along with their MD5 hashes, whoever downloads those files can verify that they are actually from WikiLeaks by calculating the MD5 hash of the downloaded files, and if the hash doesn't match what was published by WikiLeaks, then you know that the file has been modified in some way.
How does the blockchain make use of hashes? [00:02:00] Hashes are used in blockchains to represent the current state of the world. The input is the entire state of the blockchain, meaning all the transactions that have taken place so far and the resulting output hash represents the current state of the blockchain. The hash is used to agree between all parties that the world state is one in the same, but how are these hashes actually calculated?
The first hash is calculated for the first block [00:02:30] or the Genesis block using the transactions inside that block. The sequence of initial transactions is used to calculate a block hash for the Genesis block. For every new block that is generated afterwords, the previous block's hash is also used, as well as its own transactions, as input to determine its block hash. This is how a chain of blocks is formed, each new block hash pointing to the block hash that came before it.
This system of hashing guarantees that no transaction in the history can be tampered with because if any single part of the transaction changes, so does the hash of the block to which it belongs, and any following blocks' hashes as a result. It would be fairly easy to catch any tampering as a result because you can just compare the hashes. This is cool because everyone on the blockchain only needs to agree on 256 bits to represent the potentially infinite state of the blockchain. The Ethereum blockchain is currently tens of gigabytes, but the current state of the blockchain, as of this recording, is this hexadecimal hash representing 256 bits.
What about digital signatures? Digital signatures, like real signatures, are a way to prove that somebody is who they say they are, except that we use cryptography or math, which is more secure than handwritten signatures that can be [00:04:00] easily forged. A digital signature is a way to prove that a message originates from a specific person and no one else, like a hacker.
Digital signatures are used today all over the Internet. Whenever you visit a website over ACTPS, you are using SSL, which uses digital signatures to establish trust between you and the server. This means that when you visit Facebook.com, your browser can check the digital signature that came with the web page to verify that it indeed originated from Facebook and not some hacker.
In asymmetric encryption systems, users generate something called a key pair, which is a public key and a private key using some known algorithm. The public key and private key are associated with each other through some mathematical relationship. The public key is meant to be distributed publicly to serve as an address to receive messages from other users, like an IP address or home address. The private key is meant to be kept secret and is used to digitally sign messages sent to other users. The signature is included with the message so that the recipient can verify using the sender's public key. This way, the recipient can be sure that only the sender could have sent this message. Generating a key pair is analogous to creating an account on the blockchain, but without having to actually register anywhere. Pretty cool. Also, every transaction that is executed on the blockchain is digitally signed by the sender using their private key. This signature ensures that only the owner of the account can move money out of the account.

Views: 27726
Blockgeeks

Welcome to part four in our series on Elliptic Curve Cryptography. I this episode we dive into the development of the public key. In just 44 lines of code, with no special functions or imports, we produce the elliptic curve public key for use in Bitcoin. Better still, we walk you through it line by line, constant by constant. Nothing makes the process clearer and easier to understand than seeing it in straight forward code. If you've been wondering about the secp256k1 (arguably the most important piece of code in Bitcoin), well then this is the video for you.
This is part 4 of our upcoming series on Elliptic Curves. Because of such strong requests, even though this is part 4, it is the first one we are releasing. In the next few weeks we will release the rest of the series. Enjoy.
Here's the link to our Python code (Python 2.7.6):
https://github.com/wobine/blackboard101/blob/master/EllipticCurvesPart4-PrivateKeyToPublicKey.py
Here's the private key and the link to the public address that we use. Do you know why it is famous?
Private Key : A0DC65FFCA799873CBEA0AC274015B9526505DAAAED385155425F7337704883E
Public Address on Blockchain.info
https://blockchain.info/address/1JryTePceSiWVpoNBU8SbwiT7J4ghzijzW
Here's the private key we use at the end:
42F615A574E9CEB29E1D5BD0FDE55553775A6AF0663D569D0A2E45902E4339DB
Public Address on Blockchain.info
https://blockchain.info/address/16iTdS1yJhQ6NNQRJqsW9BF5UfgWwUsbF
Welcome to WBN's Bitcoin 101 Blackboard Series -- a full beginner to expert course in bitcoin. Please like, subscribe, comment or even drop a little jangly in our bitcoin tip jar 1javsf8GNsudLaDue3dXkKzjtGM8NagQe. Thanks, WBN

Views: 22951
CRI

Mia Epner, who works on security for a US national intelligence agency, explains how cryptography allows for the secure transfer of data online. This educational video explains 256 bit encryption, public and private keys, SSL & TLS and HTTPS.
Learn more at http://code.org/
Help us translate into your language: http://code.org/translate/videos
Stay in touch with us!
• on Twitter https://twitter.com/codeorg
• on Facebook https://www.facebook.com/Code.org
• on Instagram https://instagram.com/codeorg
• on Tumblr https://blog.code.org
• on LinkedIn https://www.linkedin.com/company/code...
• on Google+ https://google.com/+codeorg
Help us caption & translate this video!
https://amara.org/v/HGaS/

Views: 243712
Code.org

In this methodology, the encryption algorithm combines with a key and plaintext to create the ciphertext.
There are two types of keys
1) Symmetric Key (Private Key)
2) Asymmetric Key (Public Ky)
Symmetric Key both encryption & decryption operations use the same key with the sender and receiver
Symmetric Key encryption algorithm uses the small length key and can quickly encrypt large quantities of data

Views: 779
Sanjay Pathak

In cryptography, key size or key length is the size measured in bits of the key used in a cryptographic algorithm. An algorithm's key length is distinct from its cryptographic security, which is a logarithmic measure of the fastest known computational attack on the algorithm, also measured in bits. The security of an algorithm cannot exceed its key length, but it can be smaller. For example, Triple DES has a key size of 168 bits but provides at most 112 bits of security, since an attack of complexity 2112 is known. This property of Triple DES is not a weakness provided 112 bits of security is sufficient for an application. Most symmetric-key algorithms in common use are designed to have security equal to their key length. No asymmetric-key algorithms with this property are known; elliptic curve cryptography comes the closest with an effective security of roughly half its key length.
This video is targeted to blind users.
Attribution:
Article text available under CC-BY-SA
Creative Commons image source in video

Views: 1503
Audiopedia

AES algorithm is the Block Cipher Symmetric Algorithm
Block Size is 128 bits
Key Size is 128 bits ( 4 words or 16 Bytes )
Sub Key Size is 1 Word (32 bit)
Number of Sub keys 44 Words
Number of Rounds 10
Cipher Text Size is 128 bits

Views: 124587
Sundeep Saradhi Kanthety

And this is Module19 – Cryptography, Section 19.1 - Introduction to Cryptography
Cryptography is study of secure communication that prevent third parties or the public from reading private messages.
Cryptography means ‘hidden’ ‘writing’ and its features:
– Cryptography is synonymous with encryption, the conversion of readable information to non-readable (Ciphertext) format. Decryption is the reverse process.
– Cryptography takes care of data confidentiality, integrity, authentication and non-repudiation.
– Applications include e-commerce, payment cards, DRM etc.
– Cryptography is a technique of transforming and transmitting confidential data in an encoded way so that only authorized and intended users can obtain or work on it.
– Cryptanalysis is process of breaking the work of cryptography.
– Cryptology is the study of cryptography and cryptanalysis both.
In cryptography, a cipher or Code is an algorithm for performing encryption or decryption.
Modern encryption methods can be divided by two criteria:
– by type of key used
– by type of input data
Classical Ciphers: Ciphers written hard using simple substitutions of a letter code or a word.
– 20th century, electro-mechanical machines were invented to do encryption and decryption using transposition, polyalphabetic substitution.
– Secret communication requirement is there since age and methods vary as per need of the times.
– Symmetric key algorithms (Private-key cryptography), where the same key is used for encryption and decryption.
– Asymmetric key algorithms (Public-key cryptography), where two different keys are used for encryption and decryption.
By type of input data
– Block ciphers, which encrypt block of data of fixed size
– Stream ciphers, which encrypt continuous streams of data
Symmetric key algorithm
– In symmetric key algorithms same key is used for encryption and decryption. (e.g., DES and AES)
– The sender and receiver must have a shared key in advance exchanged secretly.
– Symmetric-key cryptography refers to encryption methods in which both the sender and receiver share the same key.
– Symmetric key ciphers are implemented as either block ciphers or stream ciphers.
– A block cipher enciphers input in blocks of plaintext as opposed to individual characters, the input form used by a stream cipher.
– Data Encryption Standard (DES) and the Advanced Encryption Standard (AES) are block cipher designs.
In asymmetric key algorithms two different keys are used for encryption and decryption. (e.g. RSA)
There are two separate keys:
– a public key is published and enables any sender to perform encryption
– a private key is kept secret by the receiver and can be used to perform decryption.
Asymmetric systems
- RSA (Rivest-Shamir-Adleman)
- ECC (Elliptic Curve Cryptography)
Symmetric systems
- AES (Advanced Encryption Standard)
- DES (Data Encryption Standard)
Cryptographic hash functions are a third type of cryptographic algorithm.
– They take a message of any length as input, and output a short, fixed length hash, which can be used in a digital signature.
– MD5 is widely used hashing.
– SHA series is more secure than MD5. SHA-2 improves SHA1
– 2012 - NIST announced that Keccak would be the new SHA-3 hash algorithm.
– Cryptographic hash functions are used to verify the authenticity of data retrieved from a source.

Views: 62
CBTUniversity

OCR Specification Reference
A Level 1.3.1c
Why do we disable comments? We want to ensure these videos are always appropriate to use in the classroom. However, we value your feedback, and are happy to consider amendments due to inaccuracies. Please get in touch with us directly at: [email protected]
For full support and additional material please visit our web site http://craigndave.org

Views: 10242
craigndave

If you find our videos helpful you can support us by buying something from amazon.
https://www.amazon.com/?tag=wiki-audio-20
Key size
In cryptography, key size or key length is the size measured in bits of the key used in a cryptographic algorithm (such as a cipher).An algorithm's key length is distinct from its original cryptographic security, which is a logarithmic measure of the fastest known computational attack on the algorithm, also measured in bits.
-Video is targeted to blind users
Attribution:
Article text available under CC-BY-SA
image source in video
https://www.youtube.com/watch?v=9VIdgf1rpaM

Views: 139
WikiAudio

Banks, Facebook, Twitter and Google use epic numbers - based on prime factors - to keep our Internet secrets. This is RSA public-key encryption.
More links & stuff in full description below ↓↓↓
Gold Vault: https://youtu.be/CTtf5s2HFkA
This video features Dr James Grime (http://singingbanana.com/). Message from James: "Thanks to Dr Chris Hughes of the University of York who showed me how to find the RSA public key from my browser, and showed me how awesome they look when you print them out."
Regarding the keys used for encryption:
x, y prime
Encode key E shares no factors with (x-1)(y-1)
Decode key is D with E*D - 1 a multiple of (x-1)(y-1)
Thanks to Drew Mokris for the animation: http://www.spinnerdisc.com/
NUMBERPHILE
Website: http://www.numberphile.com/
Numberphile on Facebook: http://www.facebook.com/numberphile
Numberphile tweets: https://twitter.com/numberphile
Subscribe: http://bit.ly/Numberphile_Sub
Videos by Brady Haran
Patreon: http://www.patreon.com/numberphile
Brady's videos subreddit: http://www.reddit.com/r/BradyHaran/
Brady's latest videos across all channels: http://www.bradyharanblog.com/
Sign up for (occasional) emails: http://eepurl.com/YdjL9
Numberphile T-Shirts: https://teespring.com/stores/numberphile
Other merchandise: https://store.dftba.com/collections/numberphile

Views: 1063469
Numberphile

Viewers like you help make PBS (Thank you 😃) . Support your local PBS Member Station here: https://to.pbs.org/donateinfi
Only 4 steps stand between you and the secrets hidden behind RSA cryptography. Find out how to crack the world’s most commonly used form of encryption.
Tweet at us! @pbsinfinite
Facebook: facebook.com/pbsinfinite series
Email us! pbsinfiniteseries [at] gmail [dot] com
Previous Episode:
Can We Combine pi & e into a Rational Number?
https://www.youtube.com/watch?v=bG7cCXqcJag&t=25s
Links to other resources:
Shor's paper: https://arxiv.org/abs/quant-ph/9508027v2
Lecture on Shor's Algorithm: https://arxiv.org/pdf/quant-ph/0010034.pdf
Blog on Shor's algorithm: http://www.scottaaronson.com/blog/?p=208
Video on RSA cryptography: https://www.youtube.com/watch?v=wXB-V_Keiu8
Another video on RSA cryptography: https://www.youtube.com/watch?v=4zahvcJ9glg
Euler's Big Idea: https://en.wikipedia.org/wiki/Euler%27s_theorem (I can find a non-wiki article, but I don't actually use this in the video. It's just where to learn more about the relevant math Euler did.)
Written and Hosted by Kelsey Houston-Edwards
Produced by Rusty Ward
Graphics by Ray Lux
Made by Kornhaber Brown (www.kornhaberbrown.com)
Challenge Winner - Reddles37
https://www.youtube.com/watch?v=bG7cCXqcJag&lc=z135cnmgxlbwch1ds233sbzgaojkivaz004
Comments answered by Kelsey:
Joel David Hamkins
https://www.youtube.com/watch?v=bG7cCXqcJag&lc=z13zdpcwyk2ofhugh04cdh4agsr2whmbsmk0k
PCreeper394
https://www.youtube.com/watch?v=bG7cCXqcJag&lc=z135w324kw21j1qi104cdzvrpoixslmq1jw

Views: 197651
PBS Infinite Series

Thomas Shrimpton and Martijn Stam and Bogdan Warinschi, Crypto 2016. Original title: A Modular Treatment of Cryptographic APIs: The Symmetric-Key Case. See http://www.iacr.org/cryptodb/data/paper.php?pubkey=27679

Views: 988
TheIACR

BlockChain class3 Jan3 |Nodes and Consensus| What is AES RSA Cryptography తెలుగులో I 9985269518
#blockchaintutorialtelugu #aesrsacryptographytelugu #blockchainexplainedtelugu
#BlockchainCourseContent #BlockchainTraining
https://www.vlrtraining.in/blockchain-online-training/
What is #Node
A #node is a device on a #blockchain network, that is, in essence, the foundation of the technology, allowing it to function and survive. ... Each cryptocurrency has its own nodes, maintaining the transaction records of that particular token. Nodes are the individual parts of the larger data structure that is a blockchain.
CONSENSUS:
#Consensus Mechanism A consensus mechanism is a fault-tolerant mechanism that is used in computer and blockchain systems to achieve the necessary agreement on a single data value or a single state of the network among distributed processes or multi-agent systems.
#AES and RSA #cryptography #Blockchaintecchnology
#Blockchainonlinetraining #Asymmetric encryption
# AES:
AES (acronym of Advanced Encryption Standard) is a symmetric encryption algorithm. The algorithm was developed by two Belgian cryptographer Joan Daemen and Vincent Rijmen. AES was designed to be efficient in both hardware and software, and supports a block length of 128 bits and key lengths of 128, 192, and 256 bits.
HOW DOES AES WORKS:
Each cipher encrypts and decrypts data in blocks of 128 bits using cryptographic keys of 128-, 192- and 256-bits, respectively.
#SYMMETRIC AES:
AES is a modern block symmetric cipher, one of the most popular ciphers in the world. It was developed in 1997 by Vincent Rijmen and Joan Daemen, and later approved as a federal encryption standard in the United States in 2002.
Block cipher with symmetric secret key
Block length = 128 bits
Key length = 128 or 192 or 256 bits
AES is considered as a strong and secure cipher. Over last few years (mostly 2005-2010) several attacks against different AES implementations were described but generally speaking they concern just some special cases and are not considered to be a threat to the AES algorithm itself.
#RSA:
RSA: The Most Used Asymmetric Algorithm
The most common asymmetric cipher currently in use is RSA, which is fully supported by the .NET Security Framework. Ron Rivest, Adi Shamir, and Leonard Adleman invented the RSA cipher in 1978 in response to the ideas proposed by Hellman, Diffie, and Merkel.
Later in this chapter, we shall see how to use the high-level implementation of RSA provided by the .NET Security Framework. But first, let's look at how RSA works at a conceptual level.Blockchain is a digital ledger in which transactions made in bitcoin or another cryptocurrency are recorded chronologically and publicly.
HOW DOES RSA KEY WORKS:
The RSA SecurID authentication mechanism consists of a "token" — either hardware (e.g. a key fob) or software (a soft token) — which is assigned to a computer user and which creates an authentication code at fixed intervals (usually 60 seconds) using a built-in clock and the card's factory-encoded almost random key
#ASYMMETRIC RSA:
RSA in one of the most popular algorithms with public key encryption. It can be used for either encryption of messages or for digital signatures.
Message encryption or authentication
Key has usually length of about 1000 to 4000 bits
RSA was designed by Ron Rivest, Adi Shamir and Leonard Adleman in 1977.
#POS:
Proof of stake (PoS) is a type of algorithm by which a cryptocurrency blockchain network aims to achieve distributed consensus. In PoS-based #cryptocurrencies, the creator of the next block is chosen via various combinations of random selection and wealth or age.
#POW:
Proof-of-Work, or PoW, is the original consensus algorithm in a Blockchain network. In Blockchain, this algorithm is used to confirm transactions and produce new blocks to the chain. With PoW, miners compete against each other to complete transactions on the network and get rewarded.
Subscribe to our Channel https://goo.gl/G3cB5Q
********************************************************************
VLR Training is the Best Software Training Institute offers online and class room training on various technologies like
from Hyderabad India with Real Time Experts.
Mail us [email protected]
Contact 9059868766
For more Details Click here http://www.vlrtraining.in/
*********************************************************************Like us on Facebook page VLR Training
https://www.facebook.com/VLRtrainingHyderabad/
-----------------------------------------------------------------------------------------
Follow us on Twitter
https://twitter.com/VlrTrainingKphb
_

Views: 102
VLR Training

This video shows an entertaining way to introduce Computer Science to school students.
For the next part, see http://nz.youtube.com/watch?v=iDVH3oCTc2c
For the first part in the series, see http://nz.youtube.com/watch?v=voqghyZbZxo
The full show is available in one clip at http://nz.youtube.com/watch?v=VpDDPWVn5-Q
For more information, see http://csunplugged.org

Views: 34933
UC Computer Science Education

Fundamentals of Computer Network Security
This specialization in intended for IT professionals, computer programmers, managers, IT security professionals who like to move up ladder, who are seeking to develop network system security skills. Through four courses, we will cover the Design and Analyze Secure Networked Systems, Develop Secure Programs with Basic Cryptography and Crypto API, Hacking and Patching Web Applications, Perform Penetration Testing, and Secure Networked Systems with Firewall and IDS, which will prepare you to perform tasks as Cyber Security Engineer, IT Security Analyst, and Cyber Security Analyst.
course 2 Basic Cryptography and Programming with Crypto API:
About this course: In this MOOC, we will learn the basic concepts and principles of cryptography, apply basic cryptoanalysis to decrypt messages encrypted with mono-alphabetic substitution cipher, and discuss the strongest encryption technique of the one-time-pad and related quantum key distribution systems. We will also learn the efficient symmetric key cryptography algorithms for encrypting data, discuss the DES and AES standards, study the criteria for selecting AES standard, present the block cipher operating modes and discuss how they can prevent and detect the block swapping attacks, and examine how to defend against replay attacks. We will learn the Diffie-Hellman Symmetric Key Exchange Protocol to generate a symmetric key for two parties to communicate over insecure channel. We will learn the modular arithmetic and the Euler Totient Theorem to appreciate the RSA Asymmetric Crypto Algorithm, and use OpenSSL utility to realize the basic operations of RSA Crypto Algorithm. Armed with these knowledge, we learn how to use PHP Crypto API to write secure programs for encrypting and decrypting documents and for signing and verify documents. We then apply these techniques to enhance the registration process of a web site which ensures the account created is actually requested by the owner of the email account.
Module 1 - Basic Cryptography
In this module we learn the basic concepts and principles of crytography, introduce the basic concept of cryptoanalysis using mono-alphabetic substitution cipher as an example, and discuss the one-time-pad and quantum key distribution concepts.
Learning Objectives
• Compose secure program with Crypto API for encryption, authentication, and integrity checking
• Understand terminologies of basic cryptography
• Understand Kerchhoff Principle
• Apply cryptoanalysis techniques on mono-alphabetic ciphers
• Explain why one time pad is strongest and understand how quantum key can be distributed

Views: 550
intrigano

Security+ Training Course Index: http://professormesser.link/sy0501
Professor Messer’s Course Notes: http://professormesser.link/501cn
Frequently Asked Questions: http://professormesser.link/faq
- - - - -
Symmetric ciphers are some of the most commonly used encryption methods on the Internet. In this video, you’ll learn about DES, 3DES, RC4, AES, Blowfish, and Twofish.
- - - - -
Subscribe to get the latest videos: http://professormesser.link/yt
Calendar of live events: http://www.professormesser.com/calendar/
FOLLOW PROFESSOR MESSER:
Professor Messer official website: http://www.professormesser.com/
Twitter: http://www.professormesser.com/twitter
Facebook: http://www.professormesser.com/facebook
Instagram: http://www.professormesser.com/instagram
Google +: http://www.professormesser.com/googleplus

Views: 21469
Professor Messer

This video is part of an online course, Applied Cryptography. Check out the course here: https://www.udacity.com/course/cs387.

Views: 10146
Udacity

Symmetric encryptionSymmetric encryption algorithms are based on one and the same key used by a sender and a recipient. The information exchange process includes three stages: - a sender sends a key to a recipient; - using this key, the sender encrypts the message and forwards it to the recipient; - the recipient receives the message and decrypts it.A number of factors account for the security level provided by conventional techniques: - Firstly, the encryption algorithm should be reliable enough so that the encrypted message could not be decrypted without the key; - Secondly, the security of the transmitted message should depend on the key only rather than on the algorithm secrecy; - And thirdly, the algorithm should prevent from learning the key even if you know a lot of encrypted/unencrypted pairs.For example, the well-known Caesar cipher is quite easy to decipher, even if you don't know the key. Let me demonstrate you how: - We write a decrypted text; - Then we write the decrypted alphabet under the text; - Then we can read the text going from line to line.However, unlike Caesar cipher, if, instead of a constant shift, we use a variable shift which also changes from message to message, we will get rather a reliable encryption system.This method of encryption is called Vigenère cipher. The shift value is defined by a key word which is usually placed in the beginning of a message. The shift is determined by comparing the key word with the transmitted word. For instance, our key word is LASER. The transmitted word will be as follows:In this event the key will be as follows:Symmetric encryption offers such advantages as high data transmission rate, simple implementation, quite a small key length, and sufficient reliability.Symmetric encryption has one substantial shortcoming. It is useless for authentication as the key is known to both parties.

Views: 1179
ChipDipvideo

الحلقة السابقة
https://www.youtube.com/watch?v=FcKxlOuGq2U
○ Encryption (Two Ways)
§ Symmetric Encryption
□ Same key both encrypts and decrypts the data.
□ Very fast, yet exchanging key is tricky
□ Very Algorithmic
□ Examples
® DES Data Encryption Standard (BROKEN)
◊ Uses key of 56 bit length
® Triple DES (3DES)
◊ Uses three keys (or two unique keys) of 56 bit each
® AES Advanced Encryption Standard
◊ Uses keys of 128, 192 or 256 bits long
□ Attacks
® Brute force
◊ Usually mitigated via increasing key length, as difficulty increases exponentially as key size increases, for example time to crack given a modern super computer.
Key Size Time To Crack
56 bits 399 seconds
128 bits 1.02 * 1018 years
192 bits 1.87 * 1037 years
256 bits 3.31 * 1056 years
◊ Side-Channel Attacks
§ Asymmetric Encryption
□ Key pairs have mathematical relationship
□ Each one can decrypt messages encrypted by the other.
□ Slow, but exchanging key is trivial
□ Very Mathematical
□ Anyone can know the Public Key
® The Public key can only be used to encrypt data
□ The Private key is kept secret, and never leaves the recipient's side.
® The Private key can only be used to decrypt data
□ Examples
® RSA (Rivest, Shamir and Adelman)
® The de-facto standard in the industry
® Public and Private keys are based on large Prime Numbers
§ Hybrid Encryption
□ Uses both Symmetric and Asymmetric encryption at the same time.
□ Goals:
® Use the performance of Symmetric Crypto
® Convenience of sharing keys using Asymmetric Crypto
® HMAC for authentication.
□ Steps: (Order is very important)
® Party 1 (Alice)
1. Generates a random AES Session Key (32 bytes / 256 bits)
2. Generates a random Initialization Vector (IV) (16 bytes / 128 bits)
3. Encrypt the message to be sent using the AES Session Key & IV
4. Calculate an HMAC of the encrypted message using the AES Session key
5. Encrypt the AES Session Key using the Public Key of Party 2 (Bob) The recipient.
6. Sends a packet of (Encrypted Message, Encrypted Session Key, Initialization Vector, and HMAC) to Bob
® Party 2 (Bob)
1. Decrypts Session key using his Private Key
2. Recalculates the HMAC of the encrypted message (Validates message integrity)
} If HMAC check pass
– Decrypts the message using the decrypted AES Session Key and Initialization Vector
} Otherwise, rejects the message because of integrity check failure.
Our facebook Page
http://facebook.com/askdeveloper
On Sound Cloud
http://soundcloud.com/askdeveloper
Please Like & Subscribe

Views: 797
Mohamed Elsherif

This video is part of the Udacity course "Intro to Information Security". Watch the full course at https://www.udacity.com/course/ud459

Views: 65633
Udacity

Source Code Project http://microify.com/1Tgn
blog melardev.x10host.com
twitter http://twitter.com/melardev
blogger https://melardev.blogspot.com
instagram https://www.instagram.com/melar_dev/
Google+ https://plus.google.com/u/0/110174297675710954678

Views: 19898
Melardev

Viet Tung Hoang and Stefano Tessaro, Crypto 2016. See http://www.iacr.org/cryptodb/data/paper.php?pubkey=27661

Views: 217
TheIACR

The large number "RSA-129" posed a challenge experts said would take 40 quadrillion years to solve - but took 17.
Featuring Ron Rivest, co-inventor of RSA... More links below...
Our original RSA video (how it all works): https://youtu.be/M7kEpw1tn50
More from Ron from this interview (quantum computing): https://youtu.be/tX7e7CgWrvM
More Ron Rivest on Numberphile: http://bit.ly/RonRivest
Ron Rivest's own website: https://people.csail.mit.edu/rivest/
Public Key Cryptography on our sister channel, Computerphile: https://youtu.be/GSIDS_lvRv4
RSA-129: 114381625757888867669235779976146612010218296721242362562561842935706935245733897830597123563958705058989075147599290026879543541
Numberphile is supported by the Mathematical Sciences Research Institute (MSRI): http://bit.ly/MSRINumberphile
We are also supported by Science Sandbox, a Simons Foundation initiative dedicated to engaging everyone with the process of science.
NUMBERPHILE
Website: http://www.numberphile.com/
Numberphile on Facebook: http://www.facebook.com/numberphile
Numberphile tweets: https://twitter.com/numberphile
Subscribe: http://bit.ly/Numberphile_Sub
Videos by Brady Haran
Patreon: http://www.patreon.com/numberphile
Brady's videos subreddit: http://www.reddit.com/r/BradyHaran/
Brady's latest videos across all channels: http://www.bradyharanblog.com/
Sign up for (occasional) emails: http://eepurl.com/YdjL9

Views: 407127
Numberphile

Cryptography and Network Security by Prof. D. Mukhopadhyay, Department of Computer Science and Engineering, IIT Kharagpur. For more details on NPTEL visit http://nptel.iitm.ac.in

Views: 18619
nptelhrd

Talk at crypto 2013. Authors: François-Xavier Standaert, Olivier Pereira, Yu Yu

Views: 194
TheIACR

Views: 10722
Internetwork Security

By Serene Ch'ng Khoo Chern and Jamie Yeoh Zi-Yi
Course CSCI361 Cryptography and Secure Applications
This video is about Cipher Block Chaining mode also known as CBC. CBC is a mode of operation for a block cipher. It uses a chaining mechanism that causes the encryption of a block of plain text and decryption of a block of cipher text to depend on all the preceding cipher text blocks. CBC mode produces different cipher text blocks even if plain text blocks are the same.
Before the encryption takes place, the plain text is split into blocks of fixed sizes depending on the size of the required input block for the type of encryption chosen. In the case where the block does not fulfil the required size, padding will be used.
The example used in this video has a plain text size of 160 bits and the encryption standard chosen is Data Encryption Standard (DES). DES requires an input block with size 64 bits and key of 64 bits which results in an output block of 64 bits. Hence, the plain text is split into 3 blocks, with the first 2 blocks having the size of 64 bits and the last block being 32 bits. This requires the last block to be padded with another 32 bits to fulfil 64 bits. This block is then treated like all the other blocks.
In the encryption process, the first block of plain text is first XOR-ed with an initialization vector, IV, of a certain length. The length is depending on the type of encryption chosen, similar to the size of the plain text blocks. So, in this example, it will be 64 bits. IV is used because the previous block does not exist. The IV is not secret but it is advisable for it to be unpredictable.
After the block is XOR-ed, the block is encrypted with an encryption method of choice. As mentioned before, this example is using DES. DES requires a key of 64 bits. After the encryption is completed, the output or cipher block is fed back to the next step. It is imperative to note that the plain text block, IV, input block and output block is of the same size, in this case, it is 64 bits.
For the following block of plain text, it is XOR-ed with the cipher block of the previous step instead of the initialization vector. This step is repeated for the remaining blocks of plain text.
Basically, in cipher block chaining, each plain text block is XOR-ed with the immediate previous cipher text block, and then encrypted.
As for the decryption process, the first block of the cipher text is decrypted with the same encryption standard used for encryption. In this example, it is the DES decryption and the same key used for encryption earlier will be used to decrypt now.
Then, the output from the DES will be XOR-ed with the same initialization vector used when it was encrypted. This would result in the first block of plain text.
As for the following block of cipher text, the block is first decrypted using DES with the same key and then XOR-ed with the cipher text block from the text of the previous block. This step is repeated for the remaining blocks of cipher text. However, if padding was used during encryption, the padding is removed only when the last block of cipher text is decrypted into plain text.

Views: 85
Serene

In this network security video tutorial we will study the DES algorithm in cryptography. DES also known as Data Encryption Standard algorithm is one of the most famous and widely studied algorithm and is very important to study especially if you are a Computer Science or Information Technology student. We will also study and understand the variations of DES that is the Types of DES.
Types of DES -
1. Double DES
2. Triple DES
2.1 Triple DES with 3 Keys
2.2 Triple DES with 2 Keys
Data Encryption Standard Algorithm(DES) -
1. The Data Encryption Standard (DES) was developed in the 1970s by the National Bureau of Standards (NBS)with the help of the National Security Agency (NSA).
2. DES is a block cipher.
It encrypts data in block size of 64 bits each.
3. It produces 64 bit of cipher text
4. Same algorithm and key are used for encryption and decryption.
5. The key length is 56 bits. The key originally consists of 64 bits; however, only 56 of these are actually used by the algorithm. Eight bits are used solely for checking parity, and are thereafter discarded. Hence the effective key length is 56 bits.
6. Consists of 16 steps, each of which is called as a round. Each round performs the steps of substitution and transposition
DES is Based on two fundamental attributes:
1. Substitution - also called as confusion
2. Transposition - also called as diffusion
Complete Network Security / Information Security Playlist - https://www.youtube.com/watch?v=IkfggBVUJxY&list=PLIY8eNdw5tW_7-QrsY_n9nC0Xfhs1tLEK
Download my FREE Network Security Android App - https://play.google.com/store/apps/details?id=com.intelisenze.networksecuritytutorials
Simple Snippets Official Website -
http://simplesnippets.tech/
Simple Snippets on Facebook -
https://www.facebook.com/simplesnippets/
Simple Snippets on Instagram -
https://www.instagram.com/simplesnippets/
Simple Snippets on Twitter -
https://twitter.com/simplesnippet
Simple Snippets Google Plus Page -
https://plus.google.com/+SimpleSnippets
Simple Snippets email ID -
[email protected]
For More Technology News, Latest Updates and Blog articles visit our Official Website - http://simplesnippets.tech/
#DES #DataEncryptionStandard #NetworkSecurity

Views: 10067
Simple Snippets

This video is part of the Udacity course "Intro to Information Security". Watch the full course at https://www.udacity.com/course/ud459

Views: 33253
Udacity

Encryption guy waxes poetic about key lengths and stuff

Views: 195
encryptionguy

The digital signature can only be generated by the Bitcoin sender. It’s a series of tamper-proof code. By verifying this code, it proves that the transaction was initiated by the sender and not altered during the process.
Digital signature employs Digital Digest and Asymmetric Cryptography. Digital Digest compresses the information to a fixed length of code, then uses the private key to encrypt it, forming a digital signature.
After completion, it groups the transaction message with the signature and send it to the miners. Miners use the sender’s public key for verification. If it’s valid, it means he did initiate the transaction and it remains unaltered.
Asymmetric cryptography refers to using the private key for encryption and public key for decryption. It seems complicated but all you need to do is to enter the private key and voilà!.
Watch the video here!
Huobi Pro will post a question in our Tweet via our Twitter account (https://twitter.com/Huobi_Pro) each time we put up an episode of Blockchain 101 post on our Twitter account, we will randomly select 20 people who answered in the format [UIDxxxxxxxx, correct answer] and retweet our post will be entitled to 1 HT each. Note that the UID entered MUST be a valid Huobi registered account.
What are you waiting for? Fastest fingers first! Grab your HT now!

Views: 811
Huobi Global

Encryption keys have a lifespan. PCI Requirement 3.6.4 states, “Cryptographic key changes for keys that have reached the end of their cryptoperiod (for example, after a defined period of time has passed and/or after a certain amount of cipher-text has been produced by a given key), as defined by the associated application vendor or key owner, and based on industry best practices and guidelines.”
Cryptoperiods are a major topic when discussing key management. So, what exactly is a cryptoperiod? A cryptoperiod is not period of time, like a month, week, or year. Rather, a cryptoperiod represents the number of transactions that a key is valid for. There are multiple factors that define a cryptoperiod. For example, key length, key strength, algorithms, exposure – all of these elements factor in. The result of these factors is the cryptoperiod. Watch this clip of Jeff Wilder explaining cryptoperiods to hear more about PCI Requirement 3.6.4.
If you store, process, or transmit cardholder data, interact with payment card data in any way, or have the ability to impact someone else’s cardholder information or the security of that information, you are subject to comply with the PCI DSS. This exclusive video series, PCI Demystified, was developed to assist your organization in understanding what the Payment Card Industry Data Security Standard (PCI DSS) is, who it applies to, what the specific requirements are, and what your organizations needs to know and do to become compliant.
Learn more at https://kirkpatrickprice.com/video/pci-requirement-3-6-4-cryptographic-key-changes-cryptoperiod-completion/
Video Transcription
When developing these keys and put them into production, understand that the encryption keys that you’re using have a given lifespan. When we specifically look at the requirements within 3.6, it states that you must rotate the keys at the end of their defined cryptoperiod. So if you’re using encryption in your environment, your assessor should be asking what your defined cryptoperiod is. Once again, it’s not up to us as assessors to define what your cryptoperiod is, but it is up to us to determine if you’ve done your due diligence around the time period that you use your key.
If I come in to assess your organization and I say, “Hey Johnny, what is your cryptoperiod?” and you say, “Well Jeff, our cryptoperiod is every year and we rotate the key then,” I might say then, “Fine, that’s great. How did you define your cryptoperiod to be a year?” If you answer, “Just because that’s what’s done,” or “That’s the way it’s always been done,” isn’t typically enough.
Understand that a cryptoperiod does not necessarily define a period of length. A cryptoperiod is not a month, a week, a year, three years, six years, whatever. A cryptoperiod is typically a number of transactions that a key is good for. So as to give an example, you need to take in multiple factor. I would recommend that you do some Google-searching on defining a cryptoperiod. But effectively what we’re going is we’re taking the key strength, the key length, the encryption algorithm that we’re using, the exposure to the key – there’s multiple variables that go into defining what a cryptoperiod is. So, we kind of take all of these numbers and we crunch them and the output of that is not a month, a year – it’s a number of transactions. The output of your numbers might say, “This encryption algorithm key that we have is good for a thousand transactions,” or it might be good for one transaction, or it might be good for a million transactions. So now that we have the number of transactions that the key is good for, then we have to look at how many transactions you process in a year.
Stay Connected
Twitter: https://twitter.com/KPAudit
LinkedIn: https://www.linkedin.com/company/kirkpatrickprice-llc
Facebook: https://www.facebook.com/kirkpatrickprice/
More Free Resources
PCI Demystified: https://kirkpatrickprice.com/pci-demystified/
Blog: https://kirkpatrickprice.com/blog/
Webinars: https://kirkpatrickprice.com/webinars/
Videos: https://kirkpatrickprice.com/video/
White Papers: https://kirkpatrickprice.com/white-papers/
About Us
KirkpatrickPrice is a licensed CPA firm, PCI QSA, and a HITRUST CSF Assessor, registered with the PCAOB, providing assurance services to over 600 clients in more than 48 states, Canada, Asia, and Europe. The firm has over 12 years of experience in information security and compliance assurance by performing assessments, audits, and tests that strengthen information security and internal controls. KirkpatrickPrice most commonly provides advice on SOC 1, SOC 2, HIPAA, HITRUST CSF, PCI DSS, ISO 27001, FISMA, and CFPB frameworks.
For more about KirkpatrickPrice: https://kirkpatrickprice.com/
Contact us today: 800-770-2701 https://kirkpatrickprice.com/contact/

Views: 241
KirkpatrickPrice

#askfaizan | #networksecurity | #syedfaizanahmad
RSA Algorithm | RSA Algorithm Concept | RSA Algorithm with Example | Hindi / Urdu https://youtu.be/s3CH9c3Jcu0
How to find Euler's Totient Function https://youtu.be/6wHwTB-bRlw
DES | Simple Explanation | Data Encryption Standard Algo https://youtu.be/oR1JQJlXtq4
Network Security - Transposition Techniques https://youtu.be/h4MOqFkN9Tk
Block Cipher Modes of Operation | CTR mode https://youtu.be/Rp5HOTe4EbE
Block Cipher Modes of Operation | OFB mode https://youtu.be/F2RwmXwrdV8
Block Cipher Modes of Operation | CFB mode https://youtu.be/yF_iA7Rv7k4
Block Cipher Modes of Operation | CBC mode | Part 2 https://youtu.be/Q7LKmASkVSU
Block Cipher Modes of Operation | ECB mode | Part 1 https://youtu.be/mkY5mNSnuko
Hill Cipher | Complete Algorithm with Example https://youtu.be/B0Q7w7Fd7ms
Playfair Substitution Cipher https://youtu.be/w_xr7pj-O6c
Monoalphabetic Substitution Cipher https://youtu.be/Hw1T7GOnVW0
Caesar Cipher | Caesar Substitution Cipher https://youtu.be/2N9GlhysYJw
PlayList : Cryptography and Network Security : https://www.youtube.com/playlist?list=PLhwpdymnbXz7hvvqhqjIIG4tEdhAgQqll
Types of Authentication in Hindi | Authentication Types in network security
Message encryption:
Cipher text Authenticator
Hash function:
H(M) = Fixed Length Code
Message authentication code (MAC):
C(M, K) = Fixed Length Code

Views: 873
Ask Faizan

(Source code on request. UPDATE: See below)
Made an encryption scheme that creates a square (padding random bytes if necessary) and shifts a square based on the password. Given the same password, it will perform the same shifts. Decryption uses the same algorithm but performs the actions backwards.
Another version (shown second, starting at 0:53) also does character substitution. This basically adds up the values of each character of the password and each character of the data, modulus the length of the character set of course. After that it still performs shifting.
It's not going to be used for anything at all ("rolling your own" is always an extremely bad idea in cryptography, I know that very well), I just enjoyed creating it. Just shifting the square around seems to give a pretty random outcome, and with character substitution you really can't tell what the original was.
The algorithm also includes an extremely simple key derivation function which obfuscates the key input for a more random looking output (though the key needs not be fixed-length). It only accepts ASCII input, no accents or euro symbols or anything outside 32-127. It's not meant to be really used anyway. Again, source available on request. Note that I can't comment because then I'd need to make a Google+ profile, but I will read comments (typically within 24 hours, assuming I get an email notification) and simply edit the description to include a link.
SOURCE CODE
Update June 2018: Wow, I had no idea there were comments on this video at all. Everyone has been asking for years! Sorry!
http://lucb1e.com/rp/php/horrible-encryption-square.php
I have to warn you, it's not super easy to use. You need to have PHP installed on the command line (Ubuntu/Debian/Mint: apt install php-cli) and run it as shown in the video. To change whether it does substitution, see the third line of the file.

Views: 4759
lucb1e

In asymmetric key cryptography, you create a secret private key, from which you derive a public key.
When you sign something with your private key, the public key is used to verify the signature.
But if someone else gets hold of your private key, they too can derive the public key, and they can start signing things (for example cryptocurrency transfers) as if they were you.
So your private key is like a secret recipe for a spirit or liquor, and your public key is like the drink made using the recipe. And just as breweries, distilleries, and soft drinks companies go to great lengths to keep their secret recipe truly secret, so must you with your private cryptographic keys.

Views: 12
Thinklair

In this tutorial i'm going to show you how to encrypt, decrypt data using AES(Advanced Encryption Standard), and storing the encrypted data in safe place.
Source code: https://drive.google.com/file/d/0BxW01l6w6JYfd1pTZVBjaWxhWEU/view?usp=sharing

Views: 59679
Dawisko1

https://8gwifi.org/hmacgen.jsp
The Keyed-Hash Message Authentication Code HMAC tutorial FIPS PUB 198-1
The purpose of a MAC is to authenticate both the source of a message and its integrity without the use of any additional mechanisms. HMACs have two functionally distinct parameters, a message input and a secret key known only to the message originator and intended receiver(s). Additional applications of keyed-hash functions include their use in challenge-response identification protocols for computing responses, which are a function of both a secret key and a challenge message.
Cryptographic key (key): a parameter used in conjunction with a cryptographic algorithm that determines the specific operation of that algorithm. In this Standard, the cryptographic key is used by the HMAC algorithm to produce a MAC on the data.
Hash function: a mathematical function that maps a string of arbitrary length (up to a pre- determined maximum size) to a fixed length string.
Keyed-hash message authentication code (HMAC): a message authentication code that uses a cryptographic key in conjunction with a hash function.
Message Authentication Code (MAC): a cryptographic checksum that results from passing data through a message authentication algorithm. In this Standard, the message authentication algorithm is called HMAC, while the result of applying HMAC is called the MAC.

Views: 14905
Zariga Tongy

What is hashing? In this video we explain how hash functions work in an easy to digest way. Hashing is the process of converting an input of any length into a fixed size string of text, using a mathematical function. 👩🎓👨🎓Learn blockchain fast at the Lisk Academy: https://lisk.io/academy
Thanks for watching! Lisk will make it easy for developers to build and deploy blockchain applications in JavaScript. Learn about the leading platform for world-changing blockchain applications at https://lisk.io/products.
👨💻For developers:
Documentation: https://lisk.io/documentation
GitHub: https://github.com/LiskHQ
Gitter: https://gitter.im/LiskHQ/lisk
🔒 Store your LSK in our official wallet: https://lisk.io/hub/
🔎 View our blockchain explorer: https://explorer.lisk.io/
🗞 Read the latest news on our blog: https://blog.lisk.io/
👫Join our community channels:
Reddit: http://reddit.com/r/lisk
Twitter: http://twitter.com/liskhq
Telegram: https://t.me/Lisk_HQ
Lisk.chat: https://lisk.chat/
Instagram: http://instagram.com/liskhq
Facebook: http://facebook.com/liskhq
LinkedIn: https://www.linkedin.com/company/lisk/

Views: 50736
Lisk

© 2019 Out of the money option call

By mid-month, the idea that Telegram might raise its fundraising round even higher was reported by Bloomberg. Early February. They come up with a lockup period that releases tokens after four waiting periods, the longest one last 18 months. Late February. Finally, Telegram has apparently offered investors some kind of refund provision if it fails to deliver the TON platform by the end of October 2019, Business Insider reported. The leader in blockchain news, CoinDesk is a media outlet that strives for the highest journalistic standards and abides by a strict set of editorial policies. CoinDesk is an independent operating subsidiary of Digital Currency Group, which invests in cryptocurrencies and blockchain startups. The filing names Ton Issuer Inc. and Telegram Group Inc. along with the two individuals, Pavel Durov and Nikolai Durov, as related persons. Apart from building on the extensive userbase Telegram has amassed, and serving as a medium of exchange with a native cryptocurrency called GRAM, the TON platform also aims to include smart contracts and decentralized services such as TON Storage and TON Proxy. Leverage and Margin Explained.