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Views: 506280 itfreetraining

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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

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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

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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

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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

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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

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Views: 6583 intrigano

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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

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This video is part of an online course, Applied Cryptography. Check out the course here: https://www.udacity.com/course/cs387.
Views: 4482 Udacity

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Views: 68321 Professor Messer

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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

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Views: 27726 Blockgeeks

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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

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Views: 243712 Code.org

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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

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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

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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

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Views: 62 CBTUniversity

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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

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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

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Views: 1063469 Numberphile

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Views: 197651 PBS Infinite Series

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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

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Views: 102 VLR Training

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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

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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

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Views: 21469 Professor Messer

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This video is part of an online course, Applied Cryptography. Check out the course here: https://www.udacity.com/course/cs387.
Views: 10146 Udacity

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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

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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

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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

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Views: 19898 Melardev

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Viet Tung Hoang and Stefano Tessaro, Crypto 2016. See http://www.iacr.org/cryptodb/data/paper.php?pubkey=27661
Views: 217 TheIACR

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Views: 407127 Numberphile

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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

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Talk at crypto 2013. Authors: François-Xavier Standaert, Olivier Pereira, Yu Yu
Views: 194 TheIACR

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Views: 10722 Internetwork Security

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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

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Views: 10067 Simple Snippets

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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

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Encryption guy waxes poetic about key lengths and stuff
Views: 195 encryptionguy

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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

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Views: 241 KirkpatrickPrice

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#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

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Views: 4759 lucb1e

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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

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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

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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

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