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NETWORK SECURITY - SHA 512 (AUTHENTICATION ALGORITHM)
 
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SHA 512 (SECURE HASH ALGORITHM) 1) PAD WITH THE BITS 100..... UNTIL LENGTH OF PLAIN TEXT REACHES 128 LESS THAN MULTIPLE OF 1024 BITS 2) APPEND 128 BIT REPRESENTATION OF ORIGINAL PLAIN TEXT MESSAGE SO THAT LENGTH EQUALS TO MULTIPLE OF 1024 3) INITIALIZE 8 BUFFERS OF SIZE 64 BITS EACH TO STORE INTERMEDIATE RESULTS AND FINAL HASH CODE. 4) PROCESS EACH 1024 BIT BLOCK IN 80 ROUNDS. 5) OUTPUT IN BUFFERS IS THE 512 BIT HASH CODE
SHA-1 (Secure hash Algorithm) working in English  | CSS series
 
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Take the full crash course of Cryptography and Security System for free at Last moment tuitions Full course : https://lastmomenttuitions.com/course/cryptography-and-system-security/ Sample Notes :https://goo.gl/QpZPF5 For full hand made notes of Artificial Intelligence its only 100 rs payment options is PAYTM :9762903078 once we get payment notification we will mail you the notes on your email id contact us at :[email protected] whatsapp :9762903078 apko koi bhi doubt ho toh app humko direct email ya phone kar sakte ho Cryptography and security systems Series introduction to CSS: https://goo.gl/tjrh1L security goals and mechanism:https://goo.gl/uq35hP symmetric cipher:https://goo.gl/KFxF9j Substitution cipher and its types:https://goo.gl/MKmPzk Transposition cipher:https://goo.gl/uHqD7i diffie -hellman: https://goo.gl/YrskC5 RSA Algorithm:https://goo.gl/KwzCBF Kerberos:https://goo.gl/MQPgzw IDEA algorithm : https://goo.gl/PTCqFH Dos and DDos attack: https://goo.gl/8T345G SQL injection:https://goo.gl/bcVHnw SHA-1 vs MD5 :https://goo.gl/QJBhJD chalo toh public bus pass hojao aur share karo videos ko whatsapp group apne last moment pe unn dosto ko jo apni tarah last moment pe padhte hai Aur videos CSS ke aane waale hai so Channel ko subscribe jaroor karna follow us on: https://www.instagram.com/last_moment_tuitions https://www.facebook.com/lastmomenttuition https://www.facebook.com/sumerr3
Views: 51516 Last moment tuitions
SHA: Secure Hashing Algorithm - Computerphile
 
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Secure Hashing Algorithm (SHA1) explained. Dr Mike Pound explains how files are used to generate seemingly random hash strings. EXTRA BITS: https://youtu.be/f8ZP_1K2Y-U Tom Scott on Hash Algorithms: https://youtu.be/b4b8ktEV4Bg 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: 414151 Computerphile
How Does SHA-1 Work - Intro to Cryptographic Hash Functions and SHA-1
 
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Learn more advanced front-end and full-stack development at: https://www.fullstackacademy.com SHA-1 stands for Secure Hash Algorithm 1, a cryptographic hash function developed by the NSA that can be used to verify that a file has been unaltered. In this video, we go over the basic features and common implementations of cryptographic hash functions before diving into the inner workings of a Javascript implementation of the SHA-1 function. Although out of use now, walking through the hash function code provides valuable insight into how these algorithms work. Watch this video to learn: - What are Cryptographic Hash Functions - Practical uses for Cryptographic Hash Functions - How does SHA-1 work
Views: 8288 Fullstack Academy
SHA-1 Algorithm ( Cryptography & Network Security)
 
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Prof.V.Bibin Christopher Department of CSE Ponjesly College of Engineering
Views: 21019 ponjesly cse
21. Cryptography: Hash Functions
 
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MIT 6.046J Design and Analysis of Algorithms, Spring 2015 View the complete course: http://ocw.mit.edu/6-046JS15 Instructor: Srinivas Devadas In this lecture, Professor Devadas covers the basics of cryptography, including desirable properties of cryptographic functions, and their applications to security. License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu
Views: 65638 MIT OpenCourseWare
How secure is 256 bit security?
 
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Supplement to the cryptocurrency video: How hard is it to find a 256-bit hash just by guessing and checking? What kind of computer would that take? Cryptocurrency video: https://youtu.be/bBC-nXj3Ng4 Thread for Q&A questions: http://3b1b.co/questions Several people have commented about how 2^256 would be the maximum number of attempts, not the average. This depends on the thing being attempted. If it's guessing a private key, you are correct, but for something like guessing which input to a hash function gives a desired output (as in bitcoin mining, for example), which is the kind of thing I had in mind here, 2^256 would indeed be the average number of attempts needed, at least for a true cryptographic hash function. Think of rolling a die until you get a 6, how many rolls do you need to make, on average? Music by Vince Rubinetti: https://vincerubinetti.bandcamp.com/album/the-music-of-3blue1brown ------------------ 3blue1brown is a channel about animating math, in all senses of the word animate. And you know the drill with YouTube, if you want to stay posted on new videos, subscribe, and click the bell to receive notifications (if you're into that). If you are new to this channel and want to see more, a good place to start is this playlist: http://3b1b.co/recommended Various social media stuffs: Website: https://www.3blue1brown.com Twitter: https://twitter.com/3Blue1Brown Patreon: https://patreon.com/3blue1brown Facebook: https://www.facebook.com/3blue1brown Reddit: https://www.reddit.com/r/3Blue1Brown
Views: 837065 3Blue1Brown
Secure Hash Algorithm
 
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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: 25806 Udacity
Securing Stream Ciphers (HMAC) - Computerphile
 
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Bit flipping a stream cipher could help you hit the Jackpot! But not with HMAC. Dr Mike Pound explains. Correction : "pseudo" is spelled incorrectly on the graphic. 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: 101060 Computerphile
NETWORK SECURITY - TYPES OF AUTHENTICATION (Message Encryption, MAC, Hash Functions)
 
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Three types of Authentications 1. Message Encryption 2. Message Authentication Code 3. Hash Functions.
Generating MD5, SHA hash in java
 
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This video demonstrate the use of MD5 hashing and SHA hash in Java. http://www.examsmyantra.com/article/101/java/using-md5-or-sha-hashing-in-java
Views: 13447 examsmyantra
SHA 1, SHA 224, SHA 256, SHA 384, SHA 512 Hashing - Cryptography with Python
 
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This tutorial explains how to create a hash using all the different versions of the SHA cryptographic algorithm.
Views: 78 ma academy
What is a SHA-256 Cryptographic Hash Algorithm?
 
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In this video, I answer a question from one of the viewers of my YouTube channel YouTube.com/GeorgeLevy : What is a SHA-256 Cryptographic Hash Algorithm? Learn more about blockchain, and Bitcoin on my online video course Blockchain and Bitcoin Fundamentals at: http://BlockchainandBitcoinFundamentals.com Sign up to receive George Levy's FREE email newsletter and a video email course on blockchain, Bitcoin and cryptocurrency ($47 Value yours free) at: https://GeorgeLevy.com/Free Subscribe to this channel to stay up to date on new educational videos published each Thursday! Follow George Levy at the following links: https://GeorgeLevy.com (George Levy Website) https://Twitter.com/GeorgeLevy https://Facebook.com/GeorgeLevyBlockchain (Official Facebook Page) Special offer for George Levy channel viewers, open a new Bitcoin wallet for Free and get $10 bonus in Bitcoin at: https://blockchaininformer.com/btcwallet
Views: 5318 George Levy
Top 10 Cryptography Algorithms in 2018
 
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In this video, I listed out Top 10 Cryptography Algorithms 10. MD5 9. SHA-0 8. SHA-1 7. HMAC 6. AES 5. Blowfish 4. DES 3. International Data Encryption Algorithm 2. Twofish 1. RSA Website: http://www.allabouttesting.org Please share and subscribe this video Disclaimer: This video is for educational purpose only. Copyright Disclaimer Under Section 107 of the Copyright Act 1976, allowance is made for "fair use" for purposes such as criticism, comment, news reporting, teaching, scholarship, and research. Fair use is a use permitted by copyright statute that might otherwise be infringing. Non-profit, educational or personal use tips the balance in favor of fair use.
Views: 2865 All About Testing
Hashing Algorithms and Security - Computerphile
 
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Audible free book: http://www.audible.com/computerphile Hashing Algorithms are used to ensure file authenticity, but how secure are they and why do they keep changing? Tom Scott hashes it out. More from Tom Scott: http://www.youtube.com/user/enyay and https://twitter.com/tomscott http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Pigeon Sound Effects courtesy of http://www.freesfx.co.uk/ Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels
Views: 717063 Computerphile
How We Created the First SHA-1 Collision and What it Means for Hash Security
 
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In this talk, we recount how we found the first SHA-1 collision. We delve into the challenges we faced from developing a meaningful payload, to scaling the computation to that massive scale, to solving unexpected cryptanalytic challenges that occurred during this endeavor. By Elie Bursztein Read More: https://www.blackhat.com/us-17/briefings/schedule/index.html#how-we-created-the-first-sha-1-collision-and-what-it-means-for-hash-security-7693
Views: 7774 Black Hat
PHP Tutorial: Password Encryption with MD5, SHA1, and Crypt -HD-
 
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In this tutorial, you will learn how to encrypt passwords and other data by using the md5, sha1, and crypt functions. Be sure to SUBSCRIBE because there will be a new tutorial every week. Follow me on Twitter @RiverCityGraphx Like us on on facebook: http://on.fb.me/i8UQpt Suggest tutorials at http://www.rivercitygraphix.com For project files, help forums, and more check out the website at http://www.rivercitygraphix.com For business related inquires contact us at [email protected]
Views: 40445 RiverCityGraphix
C# Hashing with salt using SHA-256, SHA-384, SHA-512
 
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In this tutorial I will show You how to use SHA-256, SHA-384, SHA-512 hashing in C# and compare text to hash, to see if the hash represents the text. Sorry for the poor quality microphone though :/ Source code: https://drive.google.com/file/d/0BxW01l6w6JYfUVViQUNaYjZicmc/view?usp=sharing
Views: 17946 Dawisko1
How hash function work?
 
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What is hash function/algorithm? What is mainly used for? What are three basic characteristics of a secure hash algorithm? In this video, I will also demonstrate how hash function works. Playlist: Basic Cryptography https://www.youtube.com/watch?v=vk3py9M2IfE&list=PLSNNzog5eyduN6o4e6AKFHekbH5-37BdV Advanced Cryptography: https://www.youtube.com/watch?v=TmA2QWSLSPg&list=PLSNNzog5eydtwsdT__t5WtRgvpfMzpTc7 Please leave comments, questions, and Please subscribe! Thank you very much! Sunny Classroom
Views: 30566 Sunny Classroom
How to check the SHA 256 Checksum
 
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Keep your Integrity ;)
Views: 3725 teklek411
Security Snippets: MD5, SHA-1 and SHA-2
 
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The tutorial is at: http://www.asecuritysite.com/Encryption/md5
Views: 33344 Bill Buchanan OBE
NETWORK SECURITY - MD5 ALGORITHM
 
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The MD5 algorithm is a widely used hash function producing a 128-bit hash value. Step 1. Append Padding Bits. The message is "padded" (extended) so that its length (in bits) is congruent to 448, modulo 512. ... Step 2. Append Length. ... Step 3. Initialize MD Buffer Step 4. Process Message in 16-Word Blocks. ... Step 5. Output.
Lecture 21: SHA-1 Hash Function by Christof Paar
 
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For slides, a problem set and more on learning cryptography, visit www.crypto-textbook.com
Lecture 21 (update): SHA-3 Hash Function by Christof Paar
 
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For slides, a problem set and more on learning cryptography, visit www.crypto-textbook.com
DEF CON 25 Crypto and Privacy Village - David Wong - SHA 3 vs The World
 
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Since Keccak has been selected as the winner of the SHA-3 competition in 2012, a myriad of different hash functions have been trending. From BLAKE2 to KangarooTwelve we'll cover what hash functions are out there, what is being used, and what you should use. Extending hash functions, we’ll also discover STROBE, a symmetric protocol framework derived from SHA-3.
Views: 2318 DEFCONConference
16 Cryptography Algorithms and Protocols
 
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Video 16 - "Cryptography Algorithms and Protocols" - This second nugget of the Cryptography domain lays out hashing concepts and algorithms like MD5 and SHA. Basic algorithms and encryption concepts are explored including: DES, 3DES, RSA, PGP, Elliptic curve (ECC), AES/AES256, One time pad, SSL/TLS, S/MIME, and PPTP/L2TP.
Views: 12543 SwampTarts
SHA-2 Cryptographic Hash Function
 
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For clearer illustrations, a .ppsx file (ppt slide show with narration) can be accessed at https://www.dropbox.com/s/j7k4c5nm3zgezp2/ppsxABU_SHA2_Presentation.ppsx
Views: 15420 Patricia Abu
AES and SHA Cryptography Library for Chisel
 
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Author: Sergiu Mosanu Affiliation: University of Virginia Repository: https://github.com/hplp/aes_chisel
Views: 21 Chisel
Bitcoin - Cryptographic hash function
 
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What cryptographic hash functions are and what properties are desired of them. More free lessons at: http://www.khanacademy.org/video?v=0WiTaBI82Mc 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: 218433 Khan Academy
Password Cracking - Computerphile
 
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'Beast' cracks billions of passwords a second, Dr Mike Pound demonstrates why you should probably change your passwords... Please note,at one point during the video Mike suggests using SHA512. Please check whatever the recommended process is at the time you view the video. How NOT to Store Passwords: https://youtu.be/8ZtInClXe1Q Password Choice: https://youtu.be/3NjQ9b3pgIg Deep Learning: https://youtu.be/l42lr8AlrHk Cookie Stealing: https://youtu.be/T1QEs3mdJoc 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: 1364033 Computerphile
Cryptographic Hash functions - how your passwords and other credentials are stored in databases
 
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Subscribe to our new youtube channel also : https://www.youtube.com/channel/UCNx1Gkyy9LfOxDMbcOKuV4g cryptographic hash functions - storing data in databases securely this video includes : what are hash functions , what is the use of hash functions , how confidential information like passwords are stored in databases , why do we use hash functions , properties or features of hash functions , what is an ideal hash etc I have used md5 hash an an example though md5 as per me is one of worst hashes but for learning point of view its best hash as per me . like my page on facebook : https://www.facebook.com/guidetohacking/ #cryptography #hash #function
Views: 47461 Hacks And Security
$200 DARK-WEB MYSTERY UNBOXING
 
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First Mystery Box Unboxing (weird): https://youtu.be/1UiqXUDl0lc ______________________ BELOW ARE ALL THE HINTS TO THE "GAME" Message x 42.093693, -74.112889 42.094274, -74.112277 42.094019, -74.110271 42.094310, -74.109928 ______________________ SHA-256 message 1 957d0c320c4f18b577c2a72f065a7ed21a626d3ddc326df94e65024013318c43 SHA-256 message 2 8b27f624d5632550622cd40da8de0bc6d6ded86ff7e405c30b8f555b1dbd910d SHA-256 message 3 27170698d2a607837c0af7da4ad5cbf154e76af54907eb88e277d86caf347a48 SHA-256 message 4 2e76c4c6143197989aa37c3d098007138a23f19f7cdee0754322db23f1540c22 SHA-256 message 5 *BUSTED MY COMPUTER* SHA-256 message 6 *UNKNOWN* SHA-256 message 7 *UNKNOWN* SHA-256 message 8 *UNKNOWN* SHA-256 message 9 *UNKNOWN* _______________________ LETS PLAY A GAME. in each SHA-256 output is the following information with NO SPACES at all. -First Name (ex: John) -Last Name (ex: Doe) -Last Place Seen (ex: Walmart) -Date (mmddyyyy) (ex: April 4th 2018) -Time(hhmmsspm)(hhmmssam) (ex:12:28PM) *****while trying to decode, do not put any spaces.***** examples above shown for input: johndoewalmart040420181228pm above input will give SHA-256 output of: c1d87acd32a9ec380b05b768b7697626b0205eb1fad3262e1893d232ac653fb6 *****Decode the outputs and get me in prison***** Music: -Intro and Outro Produced by Crypto NWO -Background music produced by Crypto NWO #MysteryBox #DarkWeb #Halloween #30MinutesAloneChallenge #DeepWeb
Views: 204187 Crypto NWO
SHA-2 Cryptographic Hash Function
 
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For clearer illustrations, a .ppsx file (ppt slide show) can be accessed at https://www.dropbox.com/s/j7k4c5nm3zgezp2/ppsxABU_SHA2_Presentation.ppsx
Views: 4734 Patricia Abu
Why is SHA-2 safer than SHA-1 in SSL certificates (screencast) - Cryptography/SSL 101 #6
 
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Here is a detailed walkthrough of why the strength of the hash function used to sign the certificates is very important and why SHA-1 is being phased out in favour of SHA-2. We go through the end to end process of signing a certificate, then in reverse show what happens as the signatures are validated by the browser. Then we discuss some ways in which a compromise of the hash functions can lead to dangerous scenarios on the internet. Finally a brief overview of what people who are responsible for websites need to know and the urgency of making the changes. If you're looking for a great text description of how the SSL chain works I would recommend this one. http://commandlinefanatic.com/cgi-bin/showarticle.cgi?article=art012
Views: 4689 Matt Thomas
Cryptographic Hash Functions - CompTIA Security+ SY0-401: 6.2
 
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Security+ Training Course Index: http://professormesser.link/sy0401 Professor Messer’s Course Notes: http://professormesser.link/sy0401cn Frequently Asked Questions: http://professormesser.link/faq - - - - - There are many hash functions for many different circumstances. In this video, you’ll learn about MD5, SHA, RIPEMD, and HMAC hash functions. - - - - - 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: 41472 Professor Messer
Password Hashing, Salts, Peppers | Explained!
 
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---------------------------------------------------------------------------------------------- Check out my site: http://www.seytonic.com Follow me on twitter: https://twitter.com/seytonic
Views: 51380 Seytonic
MD5 length extension and Blind SQL Injection - BruCON CTF part 3
 
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Last video from the BRUCON CTF 2016. Covering "Breaking the crypto", "Log Analysis BSQLi" and "Crypto". Topics covered: hash length extension attack, hashpump, blind sql injection, webserver access.log Filippo: https://twitter.com/FiloSottile cryptography.training: https://github.com/cryptography-training Join the discussion: https://www.reddit.com/r/LiveOverflow/comments/5ebjjr/md5_length_extension_and_blind_sql_injection/
Views: 12016 LiveOverflow
Cryptography in simple terms
 
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PDF with additional security videos: https://ibm.ent.box.com/s/ich0yyiw54y0ek6s9a66xvtjku8e42rc
Views: 201 Jose Bravo
How Does SHA256 Work?
 
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Since SHA1 has been broken, SHA256 is seen as one of the contenders to replace it. In this video I review why it might be needed and how it functions on a low and high level perspective by stepping through the algorithm with an example by converting abc to its digest. I did a similar explanation for SHA1 in another video so check that out. Ill also be doing some supplementary videos on the binary math...ill be having some fun with them :D Music Title Olympus by Ross Bugden https://www.youtube.com/watch?v=BnmglWHoVrk https://creativecommons.org/licenses/by/4.0/ Clips used One Piece film z - Eiichiro Oda, Tatsuya Nagamine Avatar the last Air Bender - Joaquim Dos Santos,Michael Dante DiMartino,Bryan Konietzko Ghost Pain - Masahiko Murata, Kazuchika Kise Terminator Genysis - Alan Taylor,Bill Carraro,Megan Ellison Phantasy Star Online - Keiichirô Kawaguchi,Kyohei Ito One Piece - Kōnosuke Uda, Eiichiro Oda,Alfred Kahn,Toei Animation,Yoshihiro Suzuki Animatrix- Peter Chung, Andrew R. Jones,Mahiro Maeda,Joel Silver The Matrix Reloaded - Lana Wachowski (as The Wachowski Brothers), Lilly Wachowski (as The Wachowski Brothers),Bruce Berman Bleach - Tite Kubo, TV Tokyo, Dentsu and Studio Pierrot Boruto: Naruto Next Generations - Noriyuki Abe and Hiroyuki Yamashita Samurai Champloo - Shinichirō Watanabe,Takatoshi Hamano,Takashi Kochiyama,Tetsuro Satomi
Views: 28053 EpicFactFind
SHAttered - SHA1 busted: demo of the files used for the collision attack
 
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In this video I quickly demonstrate what the well publicised collision attack on the SHA1 algorithm is all about and how to try it yourself. https://shattered.io You can download the files from the link below. http://thehackernews.com/2017/02/sha1-collision-attack.html Command to check the files: (in macOS terminal) shasum shattered-1.pdf shasum shattered-2.pdf
Views: 1661 Matt Thomas
How to obtain Debian Linux with full SHA512SUM verification
 
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The Crypto Dad walks you through the process of downloading and verifying Debian Linux. The Net install image is downloaded along with the ShaSum files. Using Gpg for Windows, we run through the download and verification process. Then we verify the check sum to insure that the installer has been downloaded without any corruption or alteration. This is a very important step in building a secure operating system that will be the foundation of our secure system that will give us optimal privacy and security. Important software used is: Debian Linux https://www.debian.org/ https://www.debian.org/CD/http-ftp/ https://cdimage.debian.org/debian-cd/current/amd64/iso-cd/ GnuPG. https://gnupg.org/ Specifically Gpg4Win. https://www.gpg4win.org/index.html We also cover some of the popular software that employs encryption. MD5 & SHA Checksum Utility https://raylin.wordpress.com/downloads/md5-sha-1-checksum-utility/ Or the online version: http://onlinemd5.com/ (does not include sha512sum!) Power ISO https://www.poweriso.com/ Win32 Disk imager https://sourceforge.net/projects/win32diskimager/ Sandisk home page for excellent flash drives https://www.sandisk.com/home/usb-flash Donate Bitcoin: 1JBxwXG8P6PYKKsrHKzQduM8s8RoV3dnjr
Views: 1251 Rex Kneisley
How to Use Beginner Python to Build an SHA1 Hash Brute-Forcer
 
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Learn Beginner Python3 to Create Your Own Hacking Tools Full Tutorial: http://bit.ly/SHA1Brute Subscribe to Null Byte: https://goo.gl/J6wEnH In this episode, we'll take a beginner's perspective of creating our own Python program to take advantage of a vulnerability. We'll apply this by taking a look at how hashes work, and why some aren't as good as others for storing passwords. Follow Null Byte on: Twitter: https://twitter.com/nullbytewht Flipboard: http://flip.it/3.Gf_0
Views: 11683 Null Byte
Hashing Text using MD5 and SHA - Cryptography with Python
 
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This tutorial explains how to create an MD5 and a SHA1 hash using Python.
Views: 56 ma academy
What is Hashing & Digital Signature in The Blockchain?
 
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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: 22367 Blockgeeks
How to Hash a Password Using PHP and MySQL - Create a Login Pt 2
 
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In this video I will discuss and illustrate password storage using PHP and MySQL. I will hash using SHA-512 and discuss some security issues. In the next video, I will discuss salting a password.
Views: 7296 Ken Swartwout
C# Tutorial - Encrypt and Decrypt a String | FoxLearn
 
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How to Encrypt and Decrypt a String in C#. The C# Basics beginner course is a free C# Tutorial Series that helps beginning programmers learn the basics of the C# Programming Language. This is the best way to Learn C# for beginners Encrypt your passwords with MD5 hashing in C# C# Salting & Hashing Passwords C# encrypting and decrypting using AES CBC, safe storing the encrypted data 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#
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Differences Between Encryption, Encoding and Hashing
 
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Differences Between Encryption, Encoding and Hashing
Views: 5220 LearnEveryone
Lecture 20: Hash Functions by Christof Paar
 
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For slides, a problem set and more on learning cryptography, visit www.crypto-textbook.com

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