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Cryptarithmethic Problems in eLitmus and Infosys | Tricks for Cryptarithmetic Questions and Answers
 
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If you are looking for a job or preparing for placements then register here to know how you can get a job - https://goo.gl/4525yu. If you got a call letter for the Infosys Referral Drive (Phase 3) which will be held on the 7th and 8th of April then register here for study material - https://faceprep11.typeform.com/to/P0jjyW For FREE mock tests based on the latest company pattern and FREE practice exercises visit - https://www.faceprep.in/aptipedia. In the quantitative aptitude section of the eLitmus pH test and Infosys Aptitude Test mathematical reasoning section, 1 or 2 questions will be on the topic Cryptarithmetic. What is cryptarithmetic? This topic involves just basic addition and subtraction, but it’s not easy to solve without practice. There will be two words which will be added or subtracted to get another word and all the alphabets of these words will be coded with a unique number. You will have to find all the unique numbers as coded and we have to answer the given question. Cryptarithmetic is easy if you understand the basics clearly and practice more problems. Subscribe to our channel for Placement Preparation videos - https://goo.gl/UdGsKr Don't forget to hit the bell icon to get notified for live classes. Like, comment and share our videos
Views: 64047 FACE Prep
RSA algorithm example | RSA algorithm example step by step | RSA hindi | diffie hellman example
 
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In this video it is easily explained how to find mode And formulaes of rsa As well as diffie-hellman Click here to subscribe well Academy https://www.youtube.com/wellacademy1 Facebook Me : https://goo.gl/2zQDpD Thank you for watching share with your friends Follow on : Facebook page : https://www.facebook.com/wellacademy/ Instagram page : https://instagram.com/well_academy Twitter : https://twitter.com/well_academy Google+ :https://plus.google.com/+WellAcademy1 rsa algorithm rsa algorithm in network security rsa algorithm with example rsa algorithm explained rsa algorithm example with solution rsa algorithm explanation rsa algorithm example step by step rsa algorithm hindi, rsa algorithm example, rsa algorithm explanation, diffie hellman key exchange algorithm in cryptography, diffie hellman key exchange algorithm in english, diffie hellman problem, diffie hellman key exchange algorithm with example, diffie hellman example, diffie hellman problem example, diffie hellman, diffie hellman algorithm rsa algorithm example with solution, rsa algorithm example step by step, rsa algorithm hindi, rsa algorithm explained, rsa algorithm problems, rsa algorithm in hindi
Views: 74007 Well Academy
Congruence (Modular Arithmetic) & 5 Properties Explained with 7 Problems: Ultimate Shortcuts
 
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Modular arithmetic especially the properties of congruence are an important tool in arriving at quick solutions to a variety of problems. In this video Mayank unravels this concept of Congruence starting with the basic concepts and then explaining the 5 key properties of Congruence (≡): a+c ≡ (b+d)mod N (Remainder of Sums ≡ Sum of Remainders) a-c ≡ (b-d)mod N (Remainder of Difference ≡ Difference of Remainders) ac ≡ (bd)mod N (Remainder of Products ≡ Products of Remainders) a^e ≡ b^e mod N (Remainder of Exponent ≡ Exponent of Remainders) a/e ≡ b/e (mod N/gcd(N,e)) (However, don’t do division without writing basic equation Mayank applies these concepts to arrive at quick solutions for 7 representative problems - reducing seemingly impossible math involving large numbers to mere seconds. Some example problems from the video: Find the remainder 6^(6^(6^6 ) )/7 Find the last digit of (17)^16 There are 44 boxes of chocolates with 113 chocolates in each box. If you sell the chocolates by dozens, how many will be leftover? More Motivations – Reducing Big Number @0:08 Why Bother? – Shortcuts to Several Problems @1:10 Face of a Clock @2:05 Face of a Clock Replace 12 with 0 – Module 12 @4:38 What Happens with 7 Days? @6:20 Running the Clock Backwards @8:37 Addition and Subtraction of Congruence’s @10:54 Application of Addition – Example-1 @14:30 Multiplication in Congruence’s @18:46 Application of Multiplication – Example -2/3 @22:15 Exponentiation in Congruence’s @26:08 Application of Exponentiation Example -4/5 @27:58 Division of Congruence’s: Never Divide, Think from Basics @33:37 Combining Congruence’s @38:43 Example – 6 @40:36 Concept of Multiplicative Inverse @48:33 Summary @49:30 Next – Faster Solutions to Exponent Problems @51:05 #Inverse #Exponentiation #Dozens #Subtraction #Happen #Congruence #Arithmetic #Reducing #Motivations #Delayed #Mayank #Examrace
Views: 47237 Examrace
Public Key Cryptography: RSA Encryption Algorithm
 
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RSA Public Key Encryption Algorithm (cryptography). How & why it works. Introduces Euler's Theorem, Euler's Phi function, prime factorization, modular exponentiation & time complexity. Link to factoring graph: http://www.khanacademy.org/labs/explorations/time-complexity
Views: 531954 Art of the Problem
Symmetric Key and Public Key Encryption
 
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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: 448837 itfreetraining
Lecture 14: The Generalized Discrete Log Problem and the Security of Diffie-Hellman by Christof Paar
 
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For slides, a problem set and more on learning cryptography, visit www.crypto-textbook.com
What is the problem with IoT security? - Gary explains
 
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Read more: https://goo.gl/d3cV8Q The Internet of Things has been in the news recently following the DDOS attack on Dyn. It highlighted the security problems with IoT. But what is the problem? Let me explain. Download the AndroidAuthority App: https://play.google.com/store/apps/details?id=com.androidauthority.app Subscribe to our YouTube channel: http://www.youtube.com/subscription_center?add_user=androidauthority ---------------------------------------------------- Stay connected to Android Authority: - http://www.androidauthority.com - http://google.com/+androidauthority - http://facebook.com/androidauthority/ - http://twitter.com/androidauth/ - http://instagram.com/androidauthority/ Follow the Team: Josh Vergara: https://plus.google.com/+JoshuaVergara Joe Hindy: https://plus.google.com/+JosephHindy Lanh Nguyen: https://plus.google.com/+LanhNguyenFilms Jayce Broda: https://plus.google.com/+JayceBroda Gary Sims: https://plus.google.com/+GarySims Kris Carlon: http://plus.google.com/+KrisCarlon Nirave Gondhia: http://plus.google.com/+NiraveG John Velasco: http://plus.google.com/+JohnVelasco Bailey Stein: http://plus.google.com/+BaileyStein1
Views: 36304 Android Authority
Elliptic Curve Cryptography Overview
 
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John Wagnon discusses the basics and benefits of Elliptic Curve Cryptography (ECC) in this episode of Lightboard Lessons. Check out this article on DevCentral that explains ECC encryption in more detail: https://devcentral.f5.com/articles/real-cryptography-has-curves-making-the-case-for-ecc-20832
Views: 151105 F5 DevCentral
Bitcoin: How Cryptocurrencies Work
 
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Whether or not it's worth investing in, the math behind Bitcoin is an elegant solution to some complex problems. Hosted by: Michael Aranda Special Thanks: Dalton Hubble Learn more about Cryptography: https://www.youtube.com/watch?v=-yFZGF8FHSg ---------- Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ---------- Dooblydoo thanks go to the following Patreon supporters—we couldn't make SciShow without them! Shout out to Bella Nash, Kevin Bealer, Mark Terrio-Cameron, Patrick Merrithew, Charles Southerland, Fatima Iqbal, Benny, Kyle Anderson, Tim Curwick, Will and Sonja Marple, Philippe von Bergen, Bryce Daifuku, Chris Peters, Patrick D. Ashmore, Charles George, Bader AlGhamdi ---------- Like SciShow? Want to help support us, and also get things to put on your walls, cover your torso and hold your liquids? Check out our awesome products over at DFTBA Records: http://dftba.com/scishow ---------- 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: https://bitinfocharts.com/ https://chrispacia.wordpress.com/2013/09/02/bitcoin-mining-explained-like-youre-five-part-2-mechanics/ https://www.youtube.com/watch?v=Lx9zgZCMqXE https://www.youtube.com/watch?v=nQZUi24TrdI https://bitcoin.org/en/how-it-works http://www.forbes.com/sites/investopedia/2013/08/01/how-bitcoin-works/#36bd8b2d25ee http://www.makeuseof.com/tag/how-does-bitcoin-work/ https://blockchain.info/charts/total-bitcoins https://en.bitcoin.it/wiki/Controlled_supply https://www.bitcoinmining.com/ http://bitamplify.com/mobile/?a=news Image Sources: https://commons.wikimedia.org/wiki/File:Cryptocurrency_Mining_Farm.jpg
Views: 2594687 SciShow
The Chinese Remainder Theorem made easy
 
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A solution to a typical exam question. See my other videos https://www.youtube.com/channel/UCmtelDcX6c-xSTyX6btx0Cw/.
Views: 270261 Randell Heyman
Encryption: Understanding Diffie Hellman Key Exchange by AskMisterWizard
 
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How modern encryption systems can share secret keys without transmitting them. This means that even when powerful government agencies, criminals, competitors, or ISPs listen in on absolutely everything you do, your information can still be kept private, even if you need to communicate with a total stranger and have never made any prior arrangements for privacy. This is absolutely the clearest, most comprehensive explanation of the Diffie Hellman key exchange protocol ever done in video. After you watch this, you will understand Diffie Hellman cryptographic key exchange better than 99.999% of the human population, and you won't need math beyond the 4th grade level! Find more on our web site: http://www.AskMisterWizard.com
Views: 12247 bbosen
Diffie-Hellman Key Exchange
 
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This video explains why key exchange is an issue in cryptography and introduces Diffie-Hellman's solution to this problem. NB : This video was created as a part of an assignment. It is heavily influenced from another youtube video which you can find here https://www.youtube.com/watch?v=YEBfamv-_do
Views: 45559 Bishal Sapkota
Extended Euclidean Algorithm Example
 
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In this video I show how to run the extended Euclidean algorithm to calculate a GCD and also find the integer values guaranteed to exist by Bezout's theorem.
Views: 42937 John Bowers
Lecture 12: The RSA Cryptosystem and Efficient Exponentiation by Christof Paar
 
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For slides, a problem set and more on learning cryptography, visit www.crypto-textbook.com
Lecture 4: Stream Ciphers and Linear Feedback Shift Registers by Christof Paar
 
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For slides, a problem set and more on learning cryptography, visit www.crypto-textbook.com
Discrete Log Problem - Applied Cryptography
 
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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: 12634 Udacity
Birthday probability problem | Probability and Statistics | Khan Academy
 
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The probability that at least 2 people in a room of 30 share the same birthday. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/probability/probability-and-combinatorics-topic/probability_combinatorics/e/probability_with_perm_comb?utm_source=YT&utm_medium=Desc&utm_campaign=ProbabilityandStatistics Watch the next lesson: https://www.khanacademy.org/math/probability/probability-and-combinatorics-topic/decisions-with-probability/v/simple-hypothesis-testing?utm_source=YT&utm_medium=Desc&utm_campaign=ProbabilityandStatistics Missed the previous lesson? https://www.khanacademy.org/math/probability/probability-and-combinatorics-topic/probability_combinatorics/v/bayes-theorem-visualized?utm_source=YT&utm_medium=Desc&utm_campaign=ProbabilityandStatistics Probability and statistics on Khan Academy: We dare you to go through a day in which you never consider or use probability. Did you check the weather forecast? Busted! Did you decide to go through the drive through lane vs walk in? Busted again! We are constantly creating hypotheses, making predictions, testing, and analyzing. Our lives are full of probabilities! Statistics is related to probability because much of the data we use when determining probable outcomes comes from our understanding of statistics. In these tutorials, we will cover a range of topics, some which include: independent events, dependent probability, combinatorics, hypothesis testing, descriptive statistics, random variables, probability distributions, regression, and inferential statistics. So buckle up and hop on for a wild ride. We bet you're going to be challenged AND love it! About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content. For free. For everyone. Forever. #YouCanLearnAnything Subscribe to KhanAcademy’s Probability and Statistics channel: https://www.youtube.com/channel/UCRXuOXLW3LcQLWvxbZiIZ0w?sub_confirmation=1 Subscribe to KhanAcademy: https://www.youtube.com/subscription_center?add_user=khanacademy
Views: 421157 Khan Academy
Lecture 1: Introduction to Cryptography by Christof Paar
 
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For slides, a problem set and more on learning cryptography, visit www.crypto-textbook.com. The book chapter "Introduction" for this video is also available for free at the website (click "Sample Chapter").
The RSA Encryption Algorithm (Computing an Example)
 
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solution Ch #7 book Understanding Cryptography by Christof Paar · Jan Pelzl Let the two primes p = 41 and q = 17 be given as set-up parameters for RSA. 1. Which of the parameters e1 = 32,e2 = 49 is a valid RSA exponent? Justify your choice
Views: 89 Ahmed Dawood
Solve a Linear Congruence using Euclid's Algorithm
 
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How to solve 17x ≡ 3 (mod 29) using Euclid's Algorithm. If you want to see how Bézout's Identity works, see https://www.youtube.com/watch?v=9PRPr6J_btM
Views: 173517 Maths with Jay
Mastering Chinese Remainder Theorem(CRT)- Intuitive Problem Solving & 2 Speed Tricks
 
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Chinese Remainder Theorem or CRT is useful for a variety of competitive exams including Olympiad, CAT, JEE etc. Apply CRT to remainder problems enable quick solution to otherwise impossible looking aptitude problems. Mayank explains CRT simply as an observation which allows us to express the answer to a remainder problem as a sum of components. Here all the components are completely divisible by all but one of the given numbers, i.e., each component provides the desired remainder for one of the divisions and is fully divisible by other numbers (no remainder) By understanding this simple intuition, we will develop a simple method to easily apply Chinese Remainder Theorem (CRT) to variety of problems, without resorting to complicated formulas. We will also learn two easy tricks to simplify CRT problems and computations. Remember, CRT is a powerful tool, however even after learning CRT, first try to solve the questions using LCM and HCF tricks mentioned in this video. And even when you use CRT simplify and combine the terms with common remainders to make the computations easier. Chinese Remainder Theorem (CRT) @0:09 Recap @0:34 Smallest Number When Divided by x, y and z Leaves Remainder a, b, c? @1:03 Find the Smallest number which when divided by 2, 3 and 5 produces 1, 2, 3 as remainders @1:32 Find the Smallest number which when divided by 7, 9 and 11 produces 1, 2, 3 as remainders @ 6:06 Simplifying CRT @12:41 Find the smallest number which when divided by 2, 3, and 5 produced 1, 2, 2 as remainders @12:47 24 Produces a remainder 4 when divided by 5 @18:47 Find the Smallest number which when divided by 7, 9 and 11 produces 1, 2, 3 as remainders @20:05 ■(7-1=5 & &7-2×[email protected]=7& &9-2×[email protected]=8& &11-2×3=5) CRT is Last Resort!! @22:11 Word Problems on Chinese Remainder Theorem @23:23 #Compelled #Simultaneously #Forbid #Resort #Intuitive #Simplifying #Smallest #Produce #Remainder #Relatively #Mayank #Examrace
Views: 35093 Examrace
Public Key Cryptography: Diffie-Hellman Key Exchange (short version)
 
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This is a segment of this full video: https://www.youtube.com/watch?v=YEBfamv-_do Diffie-Hellman key exchange was one of the earliest practical implementations of key exchange within the field of cryptography. It relies on the discrete logarithm problem. This test clip will be part of the final chapter of Gambling with Secrets!
Views: 442829 Art of the Problem
The Birthday Problem / Paradox
 
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How many people do you need in a group together before you've got a 50% chance of two people sharing the same birthday? If you've never seen this before, the answer is likely to surprise you. The Birthday Problem is sometimes called the Birthday Paradox, but it's not a paradox in the true sense of the word, but it is an extremely counterintuitive result. In the 2nd half of the video I will demonstrate that the result is correct by using simple probability. Once you've watched this video, next time you're in a group of people of about the right size, why not try and find out if there are any shared birthdays! Social Media: Facebook: http://facebook.com/RichardB1983 Twitter: http://twitter.com/rb357 Instagram: http://instagram.com/RichardB_1983 Google Plus: http://google.com/+RichardB1983
Views: 52725 RichardB1983
Cryptography: Crash Course Computer Science #33
 
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Today we’re going to talk about how to keep information secret, and this isn’t a new goal. From as early as Julius Caesar’s Caesar cipher to Mary, Queen of Scots, encrypted messages to kill Queen Elizabeth in 1587, theres has long been a need to encrypt and decrypt private correspondence. This proved especially critical during World War II as Allan Turing and his team at Bletchley Park attempted to decrypt messages from Nazi Enigma machines, and this need has only grown as more and more information sensitive tasks are completed on our computers. So today, we’re going to walk you through some common encryption techniques such as the Advanced Encryption Standard (AES), Diffie-Hellman Key Exchange, and RSA which are employed to keep your information safe, private, and secure. Note: In October of 2017, researchers released a viable hack against WPA2, known as KRACK Attack, which uses AES to ensure secure communication between computers and network routers. The problem isn't with AES, which is provably secure, but with the communication protocol between router and computer. In order to set up secure communication, the computer and router have to agree through what's called a "handshake". If this handshake is interrupted in just the right way, an attacker can cause the handshake to fault to an insecure state and reveal critical information which makes the connection insecure. As is often the case with these situations, the problem is with an implementation, not the secure algorithm itself. Our friends over at Computerphile have a great video on the topic: https://www.youtube.com/watch?v=mYtvjijATa4 Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios Want to know more about Carrie Anne? https://about.me/carrieannephilbin The Latest from PBS Digital Studios: https://www.youtube.com/playlist?list=PL1mtdjDVOoOqJzeaJAV15Tq0tZ1vKj7ZV Want to find Crash Course elsewhere on the internet? Facebook - https://www.facebook.com/YouTubeCrash... Twitter - http://www.twitter.com/TheCrashCourse Tumblr - http://thecrashcourse.tumblr.com Support Crash Course on Patreon: http://patreon.com/crashcourse CC Kids: http://www.youtube.com/crashcoursekids
Views: 184825 CrashCourse
The Byzantine Generals Problem and Blockchain Consensus Models | A Deep Dive
 
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In this video, I cover the Two Generals Problem, The Byzantine Generals Problem, Byzantine Fault Tolerance, Proof of Work, Proof of Stake, and Delegated Byzantine Fault Tolerance. The Byzantine Generals problem will help others understand why a blockchain does what it does, and it illustrates why they are important. Originally I was designing this video to just highlight DBFT, NEO’s consensus model, but naturally, I got a little carried away and produced this massive video. That being said, when analyzing one consensus model, it’s important to understand how they compare to other existing models. If this is too long to sit through feel free to skip around! 0:52 Two Generals Problem 2:19 Byzantine Generals Problem 5:20 Byzantine Fault Tolerance 6:25 Proof of Work Consensus 10:14 Proof of Stake Consensus 12:30 Delegated Byzantine Fault Tolerance 17:00 “I thought NEO was proof of stake?” Add me on Linkedin! https://www.linkedin.com/in/avery-carter-705ba6132 ---------- Resources: Article on the Byzantine Generals Problem https://medium.com/loom-network/understanding-blockchain-fundamentals-part-1-byzantine-fault-tolerance-245f46fe8419 Article on Proof of Work & Proof of Stake https://medium.com/loom-network/understanding-blockchain-fundamentals-part-2-proof-of-work-proof-of-stake-b6ae907c7edb Satoshi Nakamoto’s Email https://www.mail-archive.com/[email protected]/msg09997.html Ethereum Docs on Proof of Stake https://github.com/ethereum/wiki/wiki/Proof-of-Stake-FAQ#what-is-the-nothing-at-stake-problem-and-how-can-it-be-fixed NEO Docs on DBFT http://docs.neo.org/en-us/basic/consensus/consensus.html http://docs.neo.org/en-us/basic/consensus/whitepaper.html
Views: 4390 Avery Carter
Bitcoin and Byzantine Generals | Programmer explains
 
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What is the story of Byzantine Generals and how is it related to Bitcoin and Ethereum? Programmer explains. https://steemit.com/@ivanli Reddit link https://www.reddit.com/r/Buttcoin/comments/4qa12v/byzantine_generals_proofofwork_for_dummies/ Thanks for watching guys, if you'd like to support me and donate to the channel, here are my addresses: 💎 ETH 0x27F80bc928aB65B499514D9a429249F55849fc75 💎 LTC LWzA2kd6PB3niQcegAmJbTTpE5ovf812Mj 💎 BTC 1QLBCmPsrDS8YHe5AApPyFsHFnvPsTenj4 💎 DASH XfX56mNDawvmxxWv3nF9Ev93W4MsmCbeXp
Views: 27974 Ivan on Tech
Diffie-hellman key exchange | Journey into cryptography | Computer Science | Khan Academy
 
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Walkthrough of Diffie-Hellman Key Exchange Watch the next lesson: https://www.khanacademy.org/computing/computer-science/cryptography/modern-crypt/v/intro-to-rsa-encryption?utm_source=YT&utm_medium=Desc&utm_campaign=computerscience Missed the previous lesson? https://www.khanacademy.org/computing/computer-science/cryptography/modern-crypt/v/discrete-logarithm-problem?utm_source=YT&utm_medium=Desc&utm_campaign=computerscience Computer Science on Khan Academy: Learn select topics from computer science - algorithms (how we solve common problems in computer science and measure the efficiency of our solutions), cryptography (how we protect secret information), and information theory (how we encode and compress information). About Khan Academy: Khan Academy is a nonprofit with a mission to provide a free, world-class education for anyone, anywhere. We believe learners of all ages should have unlimited access to free educational content they can master at their own pace. We use intelligent software, deep data analytics and intuitive user interfaces to help students and teachers around the world. Our resources cover preschool through early college education, including math, biology, chemistry, physics, economics, finance, history, grammar and more. We offer free personalized SAT test prep in partnership with the test developer, the College Board. Khan Academy has been translated into dozens of languages, and 100 million people use our platform worldwide every year. For more information, visit www.khanacademy.org, join us on Facebook or follow us on Twitter at @khanacademy. And remember, you can learn anything. For free. For everyone. Forever. #YouCanLearnAnything Subscribe to Khan Academy’s Computer Science channel: https://www.youtube.com/channel/UC8uHgAVBOy5h1fDsjQghWCw?sub_confirmation=1 Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy
Views: 221525 Khan Academy Labs
Number Theory: Diophantine Equation: ax+by=gcd(a,b)
 
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Once you know how to solve diophantine equations with a single variable, the next step in complexity is to consider equations with two variables. The simplest such equations are linear and take the form ax+by=c. Before we solve this equation generally, we need a preliminary result. We show that you can solve the equation ax+by=GCD(a,b) by performing the Euclidean algorithm, and then reverse-substituting to arrive at a single solution. Subject: Elementary Number Theory Teacher: Michael Harrison
Views: 83530 Socratica
Bitcoin and cryptocurrency mining explained
 
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https://www.udemy.com/blockchain-for-business-the-new-industrial-revolution/?couponCode=YOUTUBE Bitcoin and cryptocurrency mining explained with the the Byzantine Generals Problem. The Byzantine Generals problem was first introduced in a computer science paper published in 1982. The problem discussed in the paper is that reliable computer systems must be able to function effectively in the presence of faulty components that may send conflicting information to different parts of the system. This issue is even more acute when we talk about decentralized computer networks. Imagine the following thought experiment: The Byzantine army has surrounded an enemy city. The army is organized into several units. Each unit is commanded by a general and they all need to come up with a coordinated plan of action. However, they are located away from each other and the only means to communicate among themselves is via messages. To make things more complicated, one or more of the generals are possibly traitors. The presence of disloyal generals means that misleading messages could be sent aiming to disrupt any coordinated plan of action, be it attack or retreat. To find a successful solution to this conundrum, the Byzantine army needs to find its path to coordinated action, one way or another. To achieve this, the Byzantine army needs an algorithm that works effectively towards a coordinated outcome where the loyal generals follow it and the traitors don’t. Now that you are familiar with the problem, let’s see its solution. It is called the Byzantine Fault Tolerance algorithm. Over the years, there have been several proposed theoretical solutions involving game theory and math. The first practical implementation of Byzantine Fault Tolerance algorithm came with the Bitcoin’s Proof-of-Work. In this case the “generals” are nodes on the Bitcoin network, also known as “miners”. A network node is a connection point that can receive, create, store and send data across a network. In other words, nodes are the connected dots that make up a network. To simplify, think of it in the following way. In the image we traditionally use to depict a blockchain, every single computer is a separate node. They are all connected and can receive, create, store, and send data to each other. In the context of the Byzantine Fault Tolerance algorithm, the important concept to grasp is that these mining nodes start from the assumption that nobody else on the network can be trusted. Proof-of-Work secures network consensus even in the presence of non-compliant nodes. That is, even if there are some Byzantine generals who are not acting in the army’s best interest, coordinated action can still be achieved. Let’s see how this mechanism works in Bitcoin. As we all know by now, Bitcoin is a peer-to-peer network where all activities are done by its users through appropriate software and hardware. These activities include making transactions, receiving transactions, and verifying and transmitting transactions. Now, this is where we need to introduce the concept of “mining”, which many of you have probably heard. Mining is an activity, carried out by network participants, which involves Proof-of-Work and results in generating new coins as a reward for the miner who successfully did this Proof-of-Work first for each new block. On Facebook: https://www.facebook.com/365careers/ On the web: http://www.365careers.com/ On Twitter: https://twitter.com/365careers Subscribe to our channel: https://www.youtube.com/365careers
Views: 7203 365 Careers
How to Find the Greatest Common Divisor by Using the Euclidian Algorithm
 
04:10
This tutorial demonstrates how the euclidian algorithm can be used to find the greatest common denominator of two large numbers. Learn Math Tutorials Bookstore http://amzn.to/1HdY8vm Donate http://bit.ly/19AHMvX
Views: 283427 Learn Math Tutorials
What is Firewall? Good or Bad? Explained in Detail
 
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Namaskaar Dosto, is video mein maine aapko firewall ke baare mein bataya hai, aap sabhi ne internet use karte time firewall ke baare mein jarur suna hoga, ab maine aapko bataya hai ki firewall kya hai? firewall kya kaam karta hai? aur aapko firewall ki kya jarurat hai? Dosto firewall ek security ki layer hai jo aapko computer ko protect karta hai malicious attacks se, yeh ek hardware bhi ho sakta hai, aur software bhi ho sakta hai, aur firewall ki madad se administration bhi kar sakte hai, kyuki jaise kisi country mein koi specific service agar government ko block karni hai toh bhi firewall kaam mein aata hai, aap yeh video dekhiye aur aapko pata chal jayega ki firewall kya hai, aur internet use karte time aapko firewall use karna kyu jaruri hai. Mujhe umeed hai ki firewall ke baare mein banayi gayi yeh video aapko pasand aayegi. Win Galaxy S7, S7 Edge Here: http://bit.ly/TheMegaGiveaway Share, Support, Subscribe!!! Subscribe: http://bit.ly/1Wfsvt4 Youtube: http://www.youtube.com/c/TechnicalGuruji Twitter: http://www.twitter.com/technicalguruji Facebook: http://www.facebook.com/technicalguruji Instagram: http://instagram.com/technicalguruji Google Plus: https://plus.google.com/+TechnicalGuruji About : Technical Guruji is a YouTube Channel, where you will find technological videos in Hindi, New Video is Posted Everyday :)
Views: 235435 Technical Guruji
Understanding The Birthday Paradox
 
07:36
In a room of just 23 people there’s a 50-50 chance of two people having the same birthday. In a room of 75 there’s a 99.9% chance of two people matching. https://betterexplained.com/articles/understanding-the-birthday-paradox/
Views: 43976 Better Explained
The one-time pad | Journey into cryptography | Computer Science | Khan Academy
 
02:56
The perfect cipher Watch the next lesson: https://www.khanacademy.org/computing/computer-science/cryptography/crypt/v/frequency-stability?utm_source=YT&utm_medium=Desc&utm_campaign=computerscience Missed the previous lesson? https://www.khanacademy.org/computing/computer-science/cryptography/crypt/v/polyalphabetic-cipher?utm_source=YT&utm_medium=Desc&utm_campaign=computerscience Computer Science on Khan Academy: Learn select topics from computer science - algorithms (how we solve common problems in computer science and measure the efficiency of our solutions), cryptography (how we protect secret information), and information theory (how we encode and compress information). About Khan Academy: Khan Academy is a nonprofit with a mission to provide a free, world-class education for anyone, anywhere. We believe learners of all ages should have unlimited access to free educational content they can master at their own pace. We use intelligent software, deep data analytics and intuitive user interfaces to help students and teachers around the world. Our resources cover preschool through early college education, including math, biology, chemistry, physics, economics, finance, history, grammar and more. We offer free personalized SAT test prep in partnership with the test developer, the College Board. Khan Academy has been translated into dozens of languages, and 100 million people use our platform worldwide every year. For more information, visit www.khanacademy.org, join us on Facebook or follow us on Twitter at @khanacademy. And remember, you can learn anything. For free. For everyone. Forever. #YouCanLearnAnything Subscribe to Khan Academy’s Computer Science channel: https://www.youtube.com/channel/UC8uHgAVBOy5h1fDsjQghWCw?sub_confirmation=1 Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy
Views: 417471 Khan Academy
Fermat's Little Theorem examples
 
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Find the least residue (modulo p) using Fermat's Little Theorem; or find the remainder when dividing by p. We start with a simple example, so that we can easily check the answer, then look at much bigger numbers where the answers cannot be directly checked on a calculator.
Views: 194250 Maths with Jay
Hill Climbing Algorithm | Artificial Intelligence | (Eng-Hindi) | #13
 
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hill climbing search algorithm 1 hill climbing algorithm evaluate initial state, if its goal state quit, otherwise make current state as initial state 2 select a operator that could generate a new state 3 evaluate new state if closer to goal make it current state if not better ignore this state 4 if current goal state than quit otherwise repeat. Follow us on : Facebook : https://www.facebook.com/wellacademy/ Instagram : https://instagram.com/well_academy Twitter : https://twitter.com/well_academy Tags : hill climbing search algorithm,hill climbing in ai,hill climbing in artificial intelligence,hill climbing algoritm,artificial intelligence hill climbing,ai hill climbing search algorithm,what is hill climbing search algorithm ?,explanantion of hill climbing search algorithm,hill climbing explanation,hill climbing working,hill climbing serach algorithm notes,artificial,intelligence,ai,algorithm,well academy
Views: 213628 Well Academy
Is the Birthday Paradox a Paradox?
 
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Is the birthday paradox…Really…a paradox? Follow me on twitter: https://twitter.com/AhSharkee Facebook Facebook.com/AhSharkee Links and References: http://betterexplained.com/articles/understanding-the-birthday-paradox/ (Regarding the birthday paradox) http://www.bbc.com/news/magazine-27835311 (more on the birthday paradox) https://en.wikipedia.org/wiki/Birthday_problem (More on the birthday paradox) http://dictionary.cambridge.org/dictionary/english/paradox (Paradox definition) https://en.wikipedia.org/wiki/Pigeonhole_principle (Pigeonhole principle) https://en.wikipedia.org/wiki/Probability_interpretations (Probability interpretations) Credits: https://pixabay.com/en/calendar-year-month-day-date-time-999172/
Views: 1106200 Sharkee
Cryptography and Solutions for Matching Problems - Micheal O. Rabin
 
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Innovations in Algorithmic Game Theory May 23rd, 2011 Hebrew University of Jerusalem First session: Micheal O. Rabin - Cryptography and Solutions for Matching Problems Session Chair: Noam Nisan.
158,962,555,217,826,360,000 (Enigma Machine) - Numberphile
 
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The Nazi's Enigma Machine - and the mathematics behind it - was a crucial part of World War II. Flaw video at: http://www.youtube.com/watch?v=V4V2bpZlqx8 More links & stuff in full description below ↓↓↓ Brown papers on ebay: bit.ly/brownpapers Dr James Grime demonstrates the machine and discusses its many configurations. James' "day job" is touring with the Enigma machine - he could even visit you - see more at http://enigma.maths.org/content/project-officer NUMBERPHILE Website: http://www.numberphile.com/ Numberphile on Facebook: http://www.facebook.com/numberphile Numberphile tweets: https://twitter.com/numberphile Subscribe: http://bit.ly/Numberphile_Sub Videos by Brady Haran Patreon: http://www.patreon.com/numberphile Brady's videos subreddit: http://www.reddit.com/r/BradyHaran/ Brady's latest videos across all channels: http://www.bradyharanblog.com/ Sign up for (occasional) emails: http://eepurl.com/YdjL9 Numberphile T-Shirts: https://teespring.com/stores/numberphile Other merchandise: https://store.dftba.com/collections/numberphile
Views: 3521754 Numberphile
Stacks - Concept and Previous year Questions on Stacks Data Structure
 
01:08:46
Thank you for watching our lectures. These Lectures are created for Thorough Understanding of Concepts for the Competitive examinations specially for UGC NET Computer Science and Applications. For Complete Study Material for UGC NET Exam preparation please call/whatsapp us at 9821876104/02 or email us at [email protected] . If you liked the video and it was helpful for you Please like the video and share it on Facebook with your friends so that others can also get benefitted from them. You can also check and visit out other playlists. I am sharing the links of other playlists here. You can also Add me on Facebook at facebook.com/Himanshu.kaushik.2590 or visit our websites www.gatelectures.com and www.digiimento.com Checkout our other playlists  Programming and Data Structures https://goo.gl/66Ndja  C Programming https://goo.gl/HGSbCR  Operating System https://goo.gl/1qp6gj  Digital Logic https://goo.gl/qhsRwH  Discrete Mathematics https://goo.gl/FjsiEk  Computer Networks https://goo.gl/DuRQPv  Theory of Computation https://goo.gl/CNKn25  Database Management System https://goo.gl/vJpDDU  UGC NET Paper 1 https://goo.gl/97Cpvo  Previous year paper Solutions https://goo.gl/KEDL9f  Compiler Design https://goo.gl/RykvXj  Artificial Intelligence https://goo.gl/WRdyYb  C Plus plus https://goo.gl/YPJsCi  Linear Programming Problem https://goo.gl/r58RxQ  UGC NET Paper 2 Solutions https://goo.gl/3Pia9w  Computer Graphics https://goo.gl/tRFa39  Microprocessor 8085 https://goo.gl/Z57Uit  DSSSB Computer Science https://goo.gl/kiZVvx  Placement Preparation https://goo.gl/siG3Ta  Daily Current Affairs  UPPSC LT Grade Teacher https://goo.gl/iZ3CY2  Current Affairs https://goo.gl/kJdnX5  NIELIT Scientist https://goo.gl/4GKNXG  Quantitative Aptitude https://goo.gl/Rzs6fj
Cryptography is a systems problem (or) 'Should we deploy TLS'
 
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Cryptography is a systems problem (or) 'Should we deploy TLS' Given by Matthew Green, Johns Hopkins University
Views: 5696 Dartmouth
The Ultraviolet Catastrophe
 
06:32
How did the field of quantum mechanics come about in the first place? The Rayleigh-Jeans catastrophe, also known as the ultraviolet catastrophe was a prediction by the Rayleigh-Jeans law that a blackbody would radiate infinite amounts of ultraviolet light. It wasn’t until Max Planck came along and predicted that light came in packets or quanta that the field of quantum mechanics emerged and unintentionally solved the ultraviolet catastrophe. Help us translate our videos! http://www.youtube.com/timedtext_cs_panel?c=UC7DdEm33SyaTDtWYGO2CwdA&tab=2 Creator: Dianna Cowern Editor: Jabril Ashe Writer: Sophia Chen Animations: Jabril Ashe/Kyle Norby Thanks to Ashley Warner and Kyle Kitzmiller http://physicsgirl.org/ http://twitter.com/thephysicsgirl http://facebook.com/thephysicsgirl http://instagram.com/thephysicsgirl Subscribe to Physics Girl for more fun physics! Music: APM
Views: 489178 Physics Girl
Birthday Paradox or birthday attack cryptography and networking security in hindi.
 
15:59
Please Fill the form - https://docs.google.com/forms/d/1kOxvqvz1IvBMHJ3UeLecLDuK7ePKjHAvHaRcxduHKEE/edit ====================================================== Answer of your Questions Asked to me. (direct Link given below) Blogger Link - http://shalik-htd.blogspot.com/ ====================================================== Hey, friends, I upload the videos in this channel in Hindi for Engineering student of UPTU and other universities for computer science and IT (information technology) students. like share and subscribe my channel ====================================================== Install C Programming Solution Android app - https://play.google.com/store/apps/details?id=com.shalik.patel.cprogrammingsolution ====================================================== ====================================================== My Career Planning android app - https://play.google.com/store/apps/details?id=guide.mycareer.com.rec.mycareer ====================================================== ====================================================== My Android App for my College Library (An Official App Of College Library) - https://play.google.com/store/apps/details?id=jrv.library.rec.reclibrary ====================================================== How to use android application - https://www.youtube.com/watch?v=1hMZCvl-JxM ====================================================== Contact me on Facebook - https://www.facebook.com/HTD-hub-250593705388294/?ref=br_rs ====================================================== Follow me on twitter - https://twitter.com/PatelShalik ======================================================
Encrypted Key Exchange - Applied Cryptography
 
02:55
This video is part of an online course, Applied Cryptography. Check out the course here: https://www.udacity.com/course/cs387.
Views: 3356 Udacity
Merkles Puzzles - Applied Cryptography
 
03:50
This video is part of an online course, Applied Cryptography. Check out the course here: https://www.udacity.com/course/cs387.
Views: 2430 Udacity
What is CTF? An introduction to security Capture The Flag competitions
 
06:46
CTFs are one of the best ways to get into hacking. They require a lot of work and dedication, but are highly rewarding and teach you a lot. Here is a quick introduction on how to get started with CTFs. Join the discussion: https://www.reddit.com/r/LiveOverflow/comments/59b1dn/what_is_ctf_an_introduction_to_security_capture/ CTFtime: https://ctftime.org/
Views: 93628 LiveOverflow
Finite fields made easy
 
08:49
Solutions to some typical exam questions. See my other videos https://www.youtube.com/channel/UCmtelDcX6c-xSTyX6btx0Cw/.
Views: 34199 Randell Heyman
The Caesar cipher | Journey into cryptography | Computer Science | Khan Academy
 
02:36
Brit explains the Caesar cipher, the first popular substitution cipher, and shows how it was broken with "frequency analysis" Watch the next lesson: https://www.khanacademy.org/computing/computer-science/cryptography/crypt/v/polyalphabetic-cipher?utm_source=YT&utm_medium=Desc&utm_campaign=computerscience Missed the previous lesson? https://www.khanacademy.org/computing/computer-science/cryptography/crypt/v/intro-to-cryptography?utm_source=YT&utm_medium=Desc&utm_campaign=computerscience Computer Science on Khan Academy: Learn select topics from computer science - algorithms (how we solve common problems in computer science and measure the efficiency of our solutions), cryptography (how we protect secret information), and information theory (how we encode and compress information). About Khan Academy: Khan Academy is a nonprofit with a mission to provide a free, world-class education for anyone, anywhere. We believe learners of all ages should have unlimited access to free educational content they can master at their own pace. We use intelligent software, deep data analytics and intuitive user interfaces to help students and teachers around the world. Our resources cover preschool through early college education, including math, biology, chemistry, physics, economics, finance, history, grammar and more. We offer free personalized SAT test prep in partnership with the test developer, the College Board. Khan Academy has been translated into dozens of languages, and 100 million people use our platform worldwide every year. For more information, visit www.khanacademy.org, join us on Facebook or follow us on Twitter at @khanacademy. And remember, you can learn anything. For free. For everyone. Forever. #YouCanLearnAnything Subscribe to Khan Academy’s Computer Science channel: https://www.youtube.com/channel/UC8uHgAVBOy5h1fDsjQghWCw?sub_confirmation=1 Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy
Views: 590627 Khan Academy
Elliptic Curves, Cryptography and Computation
 
55:10
Much of the research in number theory, like mathematics as a whole, has been inspired by hard problems which are easy to state. A famous example is 'Fermat's Last Theorem'. Starting in the 1970's number theoretic problems have been suggested as the basis for cryptosystems, such as RSA and Diffie-Hellman. In 1985 Koblitz and Miller independently suggested that the discrete logarithm problem on elliptic curves might be more secure than the 'conventional' discrete logarithm on multiplicative groups of finite fields. Since then it has inspired a great deal of research in number theory and geometry in an attempt to understand its security. I'll give a brief historical tour concerning the elliptic curve discrete logarithm problem, and the closely connected Weil Pairing algorithm.
Views: 1120 Microsoft Research

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