Search results “Understanding cryptography problems solutions”

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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.
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Views: 64047
FACE Prep

In this video it is easily explained how to find mode
And formulaes of rsa
As well as diffie-hellman
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Views: 74007
Well Academy

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

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

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

For slides, a problem set and more on learning cryptography, visit www.crypto-textbook.com

Views: 25586
Introduction to Cryptography by Christof Paar

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.
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Views: 36304
Android Authority

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

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
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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

A solution to a typical exam question. See my other videos
https://www.youtube.com/channel/UCmtelDcX6c-xSTyX6btx0Cw/.

Views: 270261
Randell Heyman

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

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

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

For slides, a problem set and more on learning cryptography, visit www.crypto-textbook.com

Views: 67467
Introduction to Cryptography by Christof Paar

For slides, a problem set and more on learning cryptography, visit www.crypto-textbook.com

Views: 77567
Introduction to Cryptography by Christof Paar

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

Views: 12634
Udacity

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:
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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?
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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!
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Views: 421157
Khan Academy

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").

Views: 420643
Introduction to Cryptography by Christof Paar

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

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

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

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

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!
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Views: 52725
RichardB1983

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
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Views: 184825
CrashCourse

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?”
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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

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:
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Views: 27974
Ivan on Tech

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).
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Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy

Views: 221525
Khan Academy Labs

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

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.
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365 Careers

This tutorial demonstrates how the euclidian algorithm can be used to find the greatest common denominator of two large numbers.
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Learn Math Tutorials

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.
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Technical Guruji

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 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
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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.
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Khan Academy

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 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.
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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

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Well Academy

Is the birthday paradox…Really…a paradox?
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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)
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Views: 1106200
Sharkee

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.

Views: 1033
Hebrew University of Jerusalem

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
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Numberphile

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
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UGC NET Computer Science CSE

Cryptography is a systems problem (or) 'Should we deploy TLS'
Given by Matthew Green, Johns Hopkins University

Views: 5696
Dartmouth

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.
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Physics Girl

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Views: 3090
hindi tutorials darshan

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

Views: 3356
Udacity

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

Views: 2430
Udacity

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

Solutions to some typical exam questions. See my other videos
https://www.youtube.com/channel/UCmtelDcX6c-xSTyX6btx0Cw/.

Views: 34199
Randell Heyman

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

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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© 2018 Out of the money option call

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