Search results “Public key cryptography rsa pdf file”
Symmetric Key and Public Key Encryption
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: 503315 itfreetraining
Public Key Cryptography w/ JAVA  (tutorial 04) - RSA Digital Signature
RSA Digital Signature JAVA Tutorial, Including Intro to Extended Euclidean Algorithm, Euler phi function, RSA generate keys, sign, and verify | Website + download source code @ http://www.zaneacademy.com | Public Key Cryptography w/ JAVA (tutorial 02) - RSA @ https://youtu.be/mddJvoloGy0 00:08 demo prebuilt version of the application 06:00 what is message confidentiality 06:18 what is message autheticity 06:38 what is message integrity 07:10 RSA digital signature 08:18 what is the Extended Euclidean Algorithm 08:56 what is the Euler Phi function 12:10 how to encrypt & decrypt with RSA 12:20 How to sign & verify with RSA 13:16 code the application 30:22 test run the application
Views: 467 zaneacademy
Digital Signature Explained in Hindi | Encryption | Decryption | Public Key | Private Key
Hello friends, Digital signature is such a common term that even a non-technical person also starts using it. But most of the people interpret this term WRONG. Well in this video, I explained digital signature in detail along with examples. This video will definitely help you to correct your concept about digital signature. I also explained encryption, decryption, public key and private key along with digital signature so that you can better understand the working of the digital signature. To connect with WeT Facts, follow Wet Facts on following platforms: Youtube: https://www.youtube.com/c/wetfacts Facebook: https://www.facebook.com/wetfacts Instagram : https://www.instagram.com/wetfacts/ (@wetfacts) Blogger: https://www.wetfacts.blogspot.in Twitter: https://www.twitter.com/WeTFacts Email: [email protected] So to keep informed, Kindly watch this video till the end. Don't forget to subscribe to this channel so that you can get updates about my new and interesting videos. Because at WeTFacts, We only talk and unveil TRUTH. ------------------------------------------------------------------------------------------------------------ DISCLAIMER: All the images shown in this video, Belongs to the respected owners/creators and not to me. I am not the owner of any imaged showed in this video. ------------------------------------------------------------------------------------------------------------ #DigitalSignature #Encryption #PublicKey
Views: 588 WeT Facts
Public Key Encryption
Public Key Encryption Public-key encryption is a cryptographic system that uses two keys a public key known to everyone and a private or secret key known only to the recipient of the message. Example: When John wants to send a secure message to Jane, he uses Jane's public key to encrypt the message. Jane then uses her private key to decrypt it. An important element to the public key system is that the public and private keys are related in such a way that only the public key can be used to encrypt messages and only the corresponding private key can be used to decrypt them. Moreover, it is virtually impossible to deduce the private key if you know the public key.
Views: 36 Information Tech
Bitcoin - Digital Signatures
A high-level explanation of digital signature schemes, which are a fundamental building block in many cryptographic protocols. More free lessons at: http://www.khanacademy.org/video?v=Aq3a-_O2NcI Video by Zulfikar Ramzan. Zulfikar Ramzan is a world-leading expert in computer security and cryptography and is currently the Chief Scientist at Sourcefire. He received his Ph.D. in computer science from MIT.
Views: 142586 Khan Academy
Introduction to Digital Signature | Public Key cryptography
This video lecture is produced by S. Saurabh. He is B.Tech from IIT and MS from USA. Introduction to Digital Signature | Public Key cryptography To study interview questions on Linked List watch http://www.youtube.com/playlist?list=PL3D11462114F778D7&feature=view_all To prepare for programming Interview Questions on Binary Trees http://www.youtube.com/playlist?list=PLC3855D81E15BC990&feature=view_all To study programming Interview questions on Stack, Queues, Arrays visit http://www.youtube.com/playlist?list=PL65BCEDD6788C3F27&feature=view_all To watch all Programming Interview Questions visit http://www.youtube.com/playlist?list=PLD629C50E1A85BF84&feature=view_all To learn about Pointers in C visit http://www.youtube.com/playlist?list=PLC68607ACFA43C084&feature=view_all To learn C programming from IITian S.Saurabh visit http://www.youtube.com/playlist?list=PL3C47C530C457BACD&feature=view_all
Views: 36336 saurabhschool
How to Decrypt the Encrypted Files and Folders in Windows 10
By using this method you can decrypt the files and folders for windows 10. Encrypted files and folders are meant to protect any intrusion or unwanted access for other users on your system. If you want to learn how to Encrypt the files and folders, then visit the following URL : https://www.youtube.com/watch?v=uF_ewHntpeg Once your files and folders are encrypted then no other user than you, can access them. Again in order to decrypt them you can use the method used in this tutorial. If you like the video, keep sharing it and post your valuable comments in the below comment box. Thank You :)
Views: 92797 Techno Math
Encrypt/Decrypt Files in C#
Source Code Project http://microify.com/1Tgn
Views: 14118 Melardev
How to Encrypt Strings and Files in Python
In this video I show you how to encrypt and decrypt strings and files using Python. I show you how to create a key, store the key and then how to use the key to encrypt and decrypt strings and files. This video demonstrates the use of the cryptography module. 🌎 Post with code and a written tutorial: https://nitratine.net/blog/post/encryption-and-decryption-in-python/ 📺 Auto Py to Exe: https://youtu.be/OZSZHmWSOeM 📺 Python GUI Using Chrome: https://youtu.be/2kbeBzEQfXE 📺 How to Send Emails in Python: https://youtu.be/YPiHBtddefI The cryptography is supported by Python 2.7 and Python 3.4 and above. (Also PyPy 5.3+) 🌎 cryptography docs: https://cryptography.io/en/latest/ 🐍 In this video I use Python 3.6. 👍🏼 Feel free to comment with any issues.
Views: 23191 PyTutorials
RSA Encryption Matlab code
=================================================== Get the code from here: https://gum.co/vefiy =================================================== This code implements RSA encryption algorithm in matlab which depend on generating very large prime numbers (there is an implemented function to generate the prime numbers randomely), these numbere are used as encryption and decryption keys using the RSA algorithm for encryption and by seperating keys as private and public as explained in the video. The code takes a text file as an input and use the content as the message to be encrypted and then the sent encrypted message along with its decryption is printed. Author: Ahmed Abu Bakr Contact me: email: [email protected] List of all my codes: https://gumroad.com/ahmedsaleh =================================================== Hire me directly on freelancer: https://www.freelancer.com/u/AhmedSobhiSaleh ===================================================
Views: 1558 Ahmed Saleh
RSA encryption and decryption tutorial
Video tutorial on how to encrypt and decrypt messages using RSA method
Views: 239 CryptOlearn time
Rsa Blind Signatures Solution - Applied Cryptography
This video is part of an online course, Applied Cryptography. Check out the course here: https://www.udacity.com/course/cs387.
Views: 1784 Udacity
Ask Developer Podcast - 49 - Cryptography - Part 3 - Digital Signatures and Protocols
○ Digital Signatures § Goal: verify Authenticity of a message. § Based on Asymmetric Cryptography. § Basic operations 1. Public / Private keys generation (using some algorithm like RSA) 2. Signing algorithm using the private key 3. Signature verification algorithm using the corresponding public key i. Extending previous Example • Steps (Order is very important, bold stuff is the difference added to authenticate sender) ® 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. Calculate Signature using the private signing key on the HMAC 7. Sends a packet of (Encrypted Message, Encrypted Session Key, Initialization Vector, HMAC, and Signature) 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 – Verify digital signature using Alice Public Key w If signature verification pass w Decrypts the message using the decrypted AES Session Key and Initialization Vector w Otherwise, identity of the sender couldn't not be verified, reject message. } Otherwise, rejects the message because of integrity check failure. • Why Order matters? ® Timing Side-Channel Attacks ® Padding-Oracle Attack ○ Protocols § TLS/SSL • How TLS/SSL Works? • Mitigates against ® Man in the Middle Attacks ® Authentication, so the client can be sure it is talking to the correct destination. § Public Key Infrastructure (PKI) • Certificates aka X.509 Certificate (Sha-1 Signature Issues) ® A digitally signed file ® Identifies (Computer / User / Device) ® Has Public & Private Key, only the certificate owner has the Private Key. ® Has Expiration date ® Information about the CA that issued the cert ® X.509 Extension Attributes (like Usage attribute) ® Revocation Information. • Certificate Authority (CA) (CNNIC, WoSign) ® Issues, signs and manages certificates. ® Famous certificate authorities (Verisign, GoDaddy, … etc). • Trust Chains ® CA's can delegate the signing job to subordinate CA's ◊ Root CA's signs an intermediate signing certificate to the subordinate CA ® The subordinate CA can then issue certificates ® To validate a certificate, the client validates the signatures of all the intermediate stages and make sure all of them are linked to a Trusted CA • Certificate Revocation Lists (CRL's) ® When a certificate is compromised (Private Key leaked) it will be published on the CRL, so each time the cert is validated, the CRL list is checked in case cert is revoked. 3. Takeaways 4. Books a. Understanding Cryptography: A Textbook for Students and Practitionershttps://www.amazon.com/Understanding-Cryptography-Textbook-Students-Practitioners/dp/3642041000 Our facebook Page http://facebook.com/askdeveloper On Sound Cloud http://soundcloud.com/askdeveloper Please Like & Subscribe
Views: 859 Mohamed Elsherif
Generating Key Pairs
This video is part of the Udacity course "Configuring Linux Web Servers". Watch the full course at https://www.udacity.com/course/ud299
Views: 1377 Udacity
Cryptography/SSL 101 #3: Digital signatures
This video builds on the first two and unites the concepts of public/private key encryption and cryptographic hash functions to explain digital signatures - a key concept that underpins the security model web transactions and bitcoin among many other things
Views: 11240 Matt Thomas
Will Quantum Computers break encryption?
How do you secure messages over the internet? How do quantum computers break it? How do you fix it? Why don't you watch the video to find out? Why does this description have so many questions? Why are you still reading? What is the meaning of life? Facebook: https://www.facebook.com/frameofessence Twitter: https://twitter.com/frameofessence YouTube: https://www.youtube.com/user/frameofessence CLARIFICATIONS: You don't actually need a quantum computer to do quantum-safe encryption. As briefly mentioned at 7:04 , there are encryption schemes that can be run on regular computers that can't be broken by quantum computers. CORRECTIONS: [2:18] Technically, you can use any key to encrypt or decrypt whatever you want. But there's a specific way to use them that's useful, which is what's shown in the video. [5:36] In RSA, depending on exactly what you mean by "private key", neither key is actually derivable from the other. When they are created, they are generated together from a common base (not just the public key from the private key). But typically, the file that stores the "private key" actually contains a bit more information than just the private key. For example, in PKCS #1 RSA private key format ( https://tools.ietf.org/html/rfc3447#appendix-A.1.2 ), the file technically contains the entire public key too. So in short, you technically can't get the public key from the private key or vice versa, but the file that contains the private key can hold more than just the private key alone, making it possible to retrieve the public key from it. Video links: Encryption and HUGE numbers - Numberphile https://youtu.be/M7kEpw1tn50 The No Cloning Theorem - minutephysics https://youtu.be/owPC60Ue0BE Quantum Entanglement & Spooky Action at a Distance - Veritasium https://youtu.be/ZuvK-od647c Sources: Quantum Computing for Computer Scientists http://books.google.ca/books/about/Quantum_Computing_for_Computer_Scientist.html?id=eTT0FsHA5DAC Random person talking about Quantum MITM attacks http://crypto.stackexchange.com/questions/2719/is-quantum-key-distribution-safe-against-mitm-attacks-too The Ekert Protocol (i.e. E91) http://www.ux1.eiu.edu/~nilic/Nina's-article.pdf Annealing vs. Universal Quantum Computers https://medium.com/quantum-bits/what-s-the-difference-between-quantum-annealing-and-universal-gate-quantum-computers-c5e5099175a1 Images, Documents, and Screenshots: Post-Quantum Cryptography initiatives http://csrc.nist.gov/groups/ST/post-quantum-crypto/cfp-announce-dec2016.html http://pqcrypto.eu.org/docs/initial-recommendations.pdf Internet map (Carna Botnet) http://census2012.sourceforge.net/ Quantum network maps https://www.slideshare.net/ADVAOpticalNetworking/how-to-quantumsecure-optical-networks http://www.secoqc.net/html/press/pressmedia.html IBM Quantum http://research.ibm.com/ibm-q/ Music: YouTube audio library: Blue Skies Incompetech: Jay Jay Pamgaea The House of Leaves Premium Beat: Cutting Edge Technology Second Time Around Swoosh 1 sound effect came from here: http://soundbible.com/682-Swoosh-1.html ...and is under this license: https://creativecommons.org/licenses/sampling+/1.0/
Views: 798553 Frame of Essence
SkyTrust - Signing/Encrypting with Adobe PDF Prof.
In this demo the SkyTrust client has already been installed. The SkyTrust system is used to sign a PDF document and encrypt/decrypt another document. The encryption process is carried out locally, because only the public key of the SkyTrust enabled certificate is required. For the decryption/signing process the private key stored on the SkyTrust server is required.
Views: 89 TheTufl
RSA Examples
The tutorial is here: http://asecuritysite.com/log/rsa_examples.pdf The calculator page is here: http://asecuritysite.com/encryption/rsa
Views: 3072 Bill Buchanan OBE
How Encryption Keeps Your Data Safe
Start protecting yourself on the web at https://NordVPN.com/SCISHOW or use code SCISHOW to save 75% off of a 3-year Virtual Private Network plan, plus 1 month free. Keeping our data safe and secure is necessary in today's world, but a lot of the encryption we depend on has been in development for thousands of years! Hosted by: Stefan Chin Head to https://scishowfinds.com/ for hand selected artifacts of the universe! ---------- Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ---------- Dooblydoo thanks go to the following Patreon supporters: Lazarus G, Sam Lutfi, D.A. Noe, الخليفي سلطان, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, Charles Southerland, Patrick D. Ashmore, charles george, Kevin Bealer, Chris Peters ---------- Looking for SciShow elsewhere on the internet? Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Tumblr: http://scishow.tumblr.com Instagram: http://instagram.com/thescishow ---------- Sources: http://book.itep.ru/depository/crypto/Cryptography_history.pdf https://www.sans.org/reading-room/whitepapers/vpns/history-encryption-730 http://cryptogramma.com/cryptogramma/How_it_works.html https://books.google.com/books?id=Zb2RBQAAQBAJ&lpg=PA14&ots=ycTpjodUS3&pg=PA14#v=onepage&f=false https://www.britannica.com/topic/transposition-cipher https://books.google.com/books?id=o3YbiVuTg70C&lpg=PP1&pg=PT29#v=onepage&q&f=false http://penelope.uchicago.edu/Thayer/E/Roman/Texts/Plutarch/Lives/Lysander*.html https://www.coursera.org/lecture/symmetric-crypto/product-cipher-d1DgA http://www.moserware.com/2009/09/stick-figure-guide-to-advanced.html https://www.youtube.com/watch?v=aH6h52aMGT8 https://dl.acm.org/citation.cfm?id=1824151 http://www.networkdls.com/Articles/tr-601.pdf ftp://ftp.rsasecurity.com/pub/pdfs/tr701.pdf https://link.springer.com/content/pdf/10.1007%2FBFb0040277.pdf http://cacr.uwaterloo.ca/hac/about/chap6.pdf https://www.youtube.com/watch?v=MsqqpO9R5Hc https://www.youtube.com/watch?v=GSIDS_lvRv4 https://www.digicert.com/TimeTravel/math.htm
Views: 95362 SciShow
SSL Certificate Explained
Views: 883794 dtommy1979
RSA Digital Signature: SIGN in Python pyCrypto & verify in JavaScript jsrsasign
In most cases, we want to interact our python server (Flask/Django) with multiple clients over the web that uses JavaScript. This is a demonstration of how can you generate a signature in python and verity that signature in JavaScript and Vice Versa. jsrsasign library test console: https://kjur.github.io/jsrsasign/sample/sample-rsasign.html
Views: 4135 Anum Sheraz
Manually Remove "Your personal files are encrypted" by  Cryptowall/Cryptorbit/Cryptolocker & others
Remove Cryptorbit, Cryptolocker, Cryptowall & others manually. No software required. I show you how to remove Cryptorbit but its the same exact steps to remove Cryptolocker as well as other similar infections. Follow me step by step. Pause this video if you need to. We will go into the registry but i will go slowly so pay attention. -First thing to do is go into you control panel and uninstall anything to do with Crypt. Some of you will have something in there, others will not. -Next we restart computer into "safe mode". Once your your computer starts to reboot back up, keep pressing the F8 key to get it in safe mode. Once there highlight and click "safe mode". -Once your computer is booted up and in safe mode click on the start button and type in "regedit" - Now, follow this exact path.. Hkey_current_User--software--microsoft--windows--current version--run- now look for Cryptorbit, right click it and press delete. And click yes to the prompt asking if you are sure you want to delete it. - Now click on the Start menu then click on "Administrator", then Appdata--Roaming-- then find and delete Cryptorbit. - Restart your computer as normal. And there you go. Congrats to you, you just did actually what these free programs will do except for adding additional malware on your computer. Please sub and Like if this worked for you. Thank you! Cyyptorbit Your personal files are encrypted. All files including videos, photos and documents, etc. on computer are encrypted. Encryption was produced using a unique public key generated for this computer. To decrypt files, you need to obtain the private key. The single copy of the private key, which will allow you to decrypt the files, located on a secret server on the Internet; the server will destroy the key after a time specified in this windows. After that, nobody and never will be to restore files. File decryption cost ~ $50. (some will say $200) In order to decrypt the files, open site 4sfxctgp53imlvzk.onion.to/index.php and follow the instruction. If 4sfxctgp53imlvzk.onion.to is not opening, please following steps below: 1. You must download and install this browser: http://www.torproject.org/projects/torbrowser.html.en 2. After installation, run the browser and enter the address: 4sfxctgp53imlvzk.onion.to/index.php 3. Follow the instructions on the web-site. We remind you that the sooner you do, the more changes are left to recover the files. Guaranteed recovery is provided within 10 days. http://barnegat-manahawkin.patch.com/groups/police-and-fire/p/prosecutor-warns-of-latest-home-computer-virus Prosecutor Warn of Latest Computer Virus
Views: 213652 iLuvTrading
Encrypting Files with OpenSSL- BASH - Linux
http://filmsbykris.com/wordpress/?p=276 Got Questions? visit http://FilmsByKris.com/forum Chat with us and learn more http://FilmsByKris.com/irc
Views: 17573 Kris Occhipinti
How Do Digital Signatures Work?
In this video, I will be showing you how digital signatures are generated and how they help in establishing non-repudiation.
Views: 176121 Fasih Khatib
Software Encryption with ASP.NET
This covers Software Encryption with ASP.NET and incudes Private Key Encryption (3DES and AES), Public Key Encryption (RSA), Hashing (MD5, and so on), Diffie-Hellman, SFE, and Role-based Security. A tutorial is here: http://buchananweb.co.uk/2011_tut_encryption.pdf An HD Version is at: http://youtu.be/iw2bJs3pi-w
Views: 3013 Bill Buchanan OBE
Lecture 18: Digital Signatures and Security Services by Christof Paar
For slides, a problem set and more on learning cryptography, visit www.crypto-textbook.com
Asymmetric Encryption and Decryption using C#
This tutorial explains how to write a program in C# for Asymmetric Encryption and Decryption, particularly using BouncyCastle API. To add BouncyCastle API, check out our previous video at: https://www.youtube.com/watch?v=4iPzIEXC7a8
Views: 2765 PKIIndia
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Views: 203 AGOS (e) Shop
How to Encrypt & Decrypt Files or Folders Using Command Prompt
Get certified after completion on of Certificate Authority (ADCS) Server 2016 Course: https://www.udemy.com/complete-certificate-authority-adcs-server-2016-course/ Learn more: http://vincenttechblog.com
Views: 85146 Vincent's Tech Blog
X.509 Digital Signature Signing (In C#)
In a previous video, Kevin shows how to create a simple self signed X.509 Certificate using OpenSSL. In this video you will learn how to use the private key to stamp an XML document with a digital signature using C#! #WiBisode #DigitalSignature #X509 #WiBitNet
Views: 32427 Kevin WiBit
Simple Custom Encryption / Decryption  of Files using Python
This video explains how to Encrypt / Decrypt Files with a key using Python. A very simple process to encrypt the files. Very basic implementation . In video a Image is encrypted but it can be applied for any file format. The key value can range from 0 to 255 Resources XOR operator https://en.wikipedia.org/wiki/XOR_gate Enumerate Python https://docs.python.org/2/library/functions.html#enumerate
Views: 4994 akbweb
Digital Signature in Hindi
This Tutorial Explain What is Digital Signature in Hindi. A Digital Signature in Hindi (not to be confused with a digital certificate) is a mathematical technique used to validate the authenticity and integrity of a message, software or digital document. It Covers Points like digital signature in cryptography in hindi, digital signature in network security and digital signature in dbms(advance database management system) Digital Signature Use Asymatric Key to Encrypt Data. Digital signatures are often used to implement electronic signatures, a broader term that refers to any electronic data that carries the intent of a signature How digital signatures work Digital signatures are based on public key cryptography, also known as asymmetric cryptography. Using a public key algorithm such as RSA, one can generate two keys that are mathematically linked: one private and one public. To create a digital signature, signing software (such as an email program) creates a one-way hash of the electronic data to be signed. The private key is then used to encrypt the hash. The encrypted hash -- along with other information, such as the hashing algorithm -- is the digital signature. The reason for encrypting the hash instead of the entire message or document is that a hash function can convert an arbitrary input into a fixed length value, which is usually much shorter. This saves time since hashing is much faster than signing. Subscribe my Channel: https://goo.gl/FYkHc5 Reference Link: https://en.wikipedia.org/wiki/Digital_signature
Views: 13172 Introtuts
Cryptography in the Open: History of Crypto and the NSA
Henry Corrigan-Gibbs reviews the history of Diffie-Hellman key exchange and how the NSA fought to keep the authors from publishing. He will give a bit of information that was not in his Stanford Magazine article on the topic. Henry is a Ph.D. student at Stanford working on cryptography under Dan Boneh. His research has included work on Riposte, an anonymous messaging system for millions of users. Slides of the talk http://www.henrycg.com/files/academic/pres/ethereum15cryptography-slides.pdf Henry Corrigan-Gibbs' website: http://www.henrycg.com/ Stanford Magazine Article: https://alumni.stanford.edu/get/page/magazine/article/?article_id=74801 Silicon Valley Ethereum Meetup: http://www.meetup.com/EthereumSiliconValley/ Organised & Recorded by Christian Peel Music: RetroFuture Clean by Kevin MacLeod (incompetech.com)
Views: 4054 EtherCasts
End to End Encryption (E2EE) - Computerphile
End to end encryption, government ministers are again talking about stopping it. What is it and why might that be a bad idea? Dr Mike Pound explains. Hololens: https://youtu.be/gp8UiYOw8Fc Blockchain: https://youtu.be/qcuc3rgwZAE http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 303987 Computerphile
C# Tutorial 49: Encrypt data from simple string in C#
visual C# Adding AES encryption to C# application Forms Application encryption encrypt- decrypt with AES using C# Forms Application Advanced Encryption Standard Rijndael cipher Forms Application C# - Simple AES encryption using Visual C# cryptographic encrypt my 128 bit string using AES encryption cryptography C#
Views: 50711 ProgrammingKnowledge
C# 6.0 Tutorial - Advanced - 79. How to Use Verify Signature Method to Verify A Signature
Learn more free at my blog http://www.manuelradovanovic.com If you have any question please feel free to ask. Subscribe me on YouTube, please! Thank You!
Views: 450 Manuel Radovanovic
PGP Encryption Tutorial (using gpg4win and Kleopatra)
A short tutorial on how to use Kleopatra and gpg4win to encrypt messages using public PGP keys. Download gpg4win and Kleopatra here: http://www.gpg4win.org/ ** Also, an easier way instead of saving the persons public key as a GPG. Just have is saved to your clipboard and click on the system tray and click 'Certificate Import' and it does it all it's self :) (Harvey Crumpet)
Views: 196648 Kevin Cronly
Euler’s Impact on Modern Cybersecurity
A history of the extremely influential Leonhard Euler. Also an overview of the following encryption algorithms: Symmetric Key Algorithm, Diffie Hellman Key-Exchange, and RSA Encryption. This video is intended for mathematicians at a college level or above. Works Cited 1) Turner, Clay S. “Euler’s Totient Function and Public Key Cryptography.” Clays Turner, 7 Nov. 2008, www.claysturner.com/dsp/totient.pdf. 2) Weaving, Timothy. “Euler’s Theorem and RSA Public Key Cryptography.” VKnight.org, 18 Jan. 2016, vknight.org/Computing_for_mathematics/Assessment/IndividualCoursework/PastCourseWorks/2015-2016/weaving2015-2016.pdf. 3) ArtOfTheProblem, director. YouTube. YouTube, YouTube, 30 July 2012, www.youtube.com/watch?v=wXB-V_Keiu8. 4) Khan, Sal. “The Fundamental Theorem of Arithmetic.” Khan Academy, www.khanacademy.org/computing/computer-science/cryptography/modern-crypt/v/the-fundamental-theorem-of-arithmetic-1. 5)Suter, Rudolf. “Die Basler Universität = L'université De Bâle = The University of Basel.” Die Basler Universität = L'université De Bâle = The University of Basel, Schweizerische Kreditanstalt, 1962. 6)“Johann Bernoulli.” Johann Bernoulli, Great Neck Publishing. 7)“Leonhard Euler.” Wikipedia, Wikimedia Foundation, 14 Apr. 2018, en.wikipedia.org/wiki/Leonhard_Euler. 8)Boyer, Carl B. “Leonhard Euler.” Encyclopædia Britannica, Encyclopædia Britannica, Inc., 8 Apr. 2018, www.britannica.com/biography/Leonhard-Euler. 9) “Math Origins: The Totient Function.” Math Origins: The Totient Function | Mathematical Association of America, www.maa.org/press/periodicals/convergence/math-origins-the-totient-function. 10) Euler The Master Of Us All Pdf, decaops.com/file/euler-the-master-of-us-all-pdf. 11)Euler_Grave_at_Alexander_Nevsky_Monastry. Russia. 12)Biographies, Famous. “Leonhard Euler.” Famous Biographies, famousbiographies.org/wp-content/uploads/2016/01/Leonhard-Euler.jpg. 13)PINIMG. “Euler's Publication.” Pinimg, i.pinimg.com/originals/38/7c/f4/387cf423c418707bd05ddb9777975218.jpg.
Lesson 1: History of cryptography and its early stages in Europe (intypedia)
Lesson 1: Alice and Bob are presenting the first subject of the encyclopedia: a walkthrough of the History of Cryptography and its early stages in Europe till World War I. Author: Arturo Ribagorda Garnacho, Carlos III University of Madrid. Script, slideshow and exercises: http://www.intypedia.com/?lang=en An intypedia team video
Views: 11332 UPM
Digital Signing and Verification using CSharp
This tutorial demonstrates digital signing and verification using the Bouncy Castle APIs in C#.
Views: 22591 PKIIndia
Hashing Encryption Decryption Digital Signature Signing Verification Openssl Pkcs7
Reach me at linked in: www.linkedin.com/in/sameer-pasha-7aba6393 This video briefs on encryption, decryption and generating as well as verifying digital signatures. ============= NOTE: Replace GREATER-ARROW with angle-bracket below, as angle-brackets are not allowed in description. Commands used: Generate hash: md5sum Plaintext.txt gcc hash_func.c -lcrypto Encrypt a file: openssl enc -aes-128-cbc -in Plaintext.txt -K ABCDEF12345 -iv ABCDEF GREATER-ARROW Cipher.txt Decrypt a file: openssl enc -d -aes-128-cbc -in Cipher.txt -K ABCDEF12345 -iv ABCDEF Generate a detached signature: openssl smime -binary -sign -in Plaintext.txt -signer PK.crt -inkey PK.key -outform pem -out file.p7b Dump signature contents: openssl asn1parse -in file.p7b -dump -i ==== Generating digital-signature: sha1sum Plaintext.txt | cut -d ' ' -f 1 GREATER-ARROW hash openssl enc -aes-128-cbc -in hash -K ABCDEF12345 -iv ABCDEF GREATER-ARROW Signature.bin Verifying digital-signature: sha1sum Plaintext.txt | cut -d ' ' -f 1 GREATER-ARROW hash_1 openssl enc -d -aes-128-cbc -in Signature.bin -K ABCDEF12345 -iv ABCDEF GREATER-ARROW hash_2 cat hash_1 cat hash_2
Views: 3320 Sameer Pasha
MD5 Encryption & Password Saving in PHP function
In this video MD5 Message-Digest Algorithm takes as input a message of arbitrary length and produces as output a 128-bit "fingerprint" or "message digest" of the input. The MD5 algorithm is intended for digital signature applications, where a large file must be "compressed" in a secure manner before being encrypted with a private (secret) key under a public-key cryptosystem such as RSA." The Syntax of the PHP function is md5(string,raw) .
PGP Simulation RSA - Mathematica Module - digital signature | Krypto ** | gymer math Jorma Wassmer
Hier gehts zum PDF: https://www.dropbox.com/s/so0pryt2sqsgeep/pdf%20RSA%20Simulation%20mit%20signiertem%20Hash.pdf?dl=0 In dieser Sequenz werden die Module des Mathematica-files zur Simulation von PGP (digital signature on fingerprint) mit RSA kommentiert.
Views: 76 Jorma Wassmer
Digital Signature Algorithm? Keep your's Safe! Explained in Hindi/Urdu
Digital Signature Algorithm? Keep your's Safe! Explained in Hindi/Urdu Asslam O Alikum Dosto,Aaj ki is video mein maine aap ko Digital Signatures k bary mein batany ki koshish ki ha, aap sab doston ny bohat baar DIGITAL SIGNATURE k bary mein sona ho ga,Ab daily life mein to aap sabhi normal signatures ko use karty hain, lakin dosto yahan per Digital Signatures bilkul alag concept ha or kaafi important bhee ha. Dosto mujhe umeed hai k Digital Signature Algorithm ki yeh video aap ko pasand aaye ge.Techinfoedu Channel ko Subscribe krny k sath sath video ko Like or apny doston k sath Share krna mat bhholiya ga, Hamesha Khush rahain or Aap ka din accha guzry ALLAH HAFIZ.................. Share, Support, Subscribe!!! Thumbnail and Image Credits: Google Search Cell Phone Break the Signals? What is Jammer? Explained in [Hindi/Urdu] https://www.youtube.com/watch?v=d4NBcH7J5a0 How to earn Online| 5 Ways to EARN Online 100% Legal https://www.youtube.com/watch?v=A-f6AbhSeek 5G Technology Review - The Future is Near | Detail Explained in [Hindi/Urdu] https://www.youtube.com/watch?v=_nS14KKY8Ho How to repair a water damage Phone | Best 3 Methods in [Hindi/Urdu] https://www.youtube.com/watch?v=uC-Qm_2n3OY How to Check Laptop Generation in Windows 7, 8, 8.1, 10 Explained https://www.youtube.com/watch?v=zjmbxDLpzA8 DSLR Effects in your Android Phone Very Easily Explained in [Hindi/Urdu] https://www.youtube.com/watch?v=9Aj8h37dS8A Blasting Batteries| Note 7 Battery Explosion | Exploding Li-ion Batteries Explained https://www.youtube.com/watch?v=zOhh5ubWtYw How to Check Your SmartPhone is Original or Fake https://www.youtube.com/watch?v=DHDyn3T4xn4 why can't you use phones on planes? https://www.youtube.com/watch?v=_GSNYP_dcEQ What is Cache Memory? Detail Explained in [Hindi/Urdu] https://www.youtube.com/watch?v=_DuePPFkqCo Top 10 Secret Tips Buying Second Hand Smart Phones Tutorial https://www.youtube.com/watch?v=M-2IUCga00s INTRODUCTION TO DIGITAL SIGNATURES, what is digital signature in hindi, digital signature in cryptography, How Do Digital Signatures Work?, digital signatures explained, digital signature explained easy, pdf digital signatures explained, digital signature algorithm explained, digital signatures explained, digital signature explained easy, pdf digital signatures explained, digital signature algorithm explained, digital signature algorithm explained, digital signatures explained by, digital signature explained easy, digital signatures explained guitar, pdf digital signatures explained, digital signatures explained simply, digital signatures explained uk, digital signatures explained xkcd, digital signatures explained xda, digital signatures explained youtube, digital signature, digital signatures, signatures, digital signature online, how to get digital signature, digital signature download, public-key cryptography, free digital signature, cryptography, pdf, encryption, ssl, private key,digital certificate, digital signature pdf, explained, public key, 128 bit encryption, rsa, what is digital encryption, how to create an e-signature, digitally signing a document, what is digital signature, document management system, user directories, hash, excel, word, cosign digital signatures, cosign, arx, public private key, security,cryptography,public key Subscribe: http://goo.gl/c4oenk Youtube: http://www.youtube.com/c/Techinfoedu Twitter: http://twitter.com/TechInfoEdu8079 Facebook: http://www.facebook.com/Techinfoedu-1682194382043556 Instagram: https://www.instagram.com/TechInfoEdu Google Plus: https://plus.google.com/+Techinfoedu Pintrest: https://www.pinterest.com/techinfoedu About : Techinfoedu is a Youtube Channel,where you will find Latest Technological videos in Hindi/Urdu.and New Video is Posted Everyday :) :) :)
Views: 8041 Tech Info Edu
Public Key Crypto and Digital Signatures (ITS335, L05, Y15)
Public key crypto concepts; Hash functions; digital signatures. Course material via: http://sandilands.info/sgordon/teaching
Views: 949 Steven Gordon
A Concept of Private Asymmetric Encryption
Notes: "Dot.Number" is Radix Notation using "Dots" instead of "Commas". There is an important reason that each radix integer = ASC(Byte) + 1. This allows for a sequence of binary zeros (ASC 0) to be properly encrypted as shown in the very first simulation screen, where could NOT be properly encrypted UNLESS it was first incremented to before encryption. Regardless of the number-base, without changing to before encryption, the resulting radix integer would be 0, which would NOT work for proper decryption. Each simulation screen shows BOTH the encryption and decryption of the bytes shown for illustration purposes. If this was a file, a total of 92 bytes would have been encrypted into "spread spectrums" of 117 bytes with 25 different Number-Bases. Notice on each simulation screen that the RANGE of Number-Bases that can be pseudo-randomly used is a function of the number of bytes that are pseudo-randomly "grabbed" as the file is encrypted. A PDF with a complete explanation and pseudo source code for creating an encryption program is available for viewing and/or download at: https://sites.google.com/site/2eclectic4me/home/asymmetric-encryption
Views: 327 artmaker43
Upload file with encryption and download file with decryption using asp.net c#.
For Complete Step by Step Tutorial and source code visit : http://dotnetawesome.blogspot.com/2013/11/how-to-upload-file-with-encryption-and.html
Views: 30496 sourav mondal
Steps to Create Digital Certificate, Theory of Registration Authority in Hindi
Digital Certification Creation - Steps to Create Digital Certificate, Theory of Registration Authority Keywords: Digital Certificate Steps to Create Digital Certificate Definition of Registration Authority Need of Registration Authority Network Security Notes