cryptography - New Videos

Cryptography: Crash Course Computer Science #33Cryptography: Crash Course Computer Science #33
00:12:33October 25, 2017, 3:11 pm
Cryptography: Crash Course Computer Science #33

Channel: CrashCourse & Total View: 125707

Add Date: October 25, 2017, 3:11 pm & Duration: 00:12:33

Likes: 3822 | Dislike: 68


John Green, Hank Green, vlogbrothers, Crash Course, crashcourse, education, computing, computers, crash course computer science, compsci, cryptography, codebreaking, enigma, allan turing, encryption, decryption, cipher, des, res, key exchange, https, diffie-hellman, private key, rsa, public key

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...

[Hindi] What is Cryptography ? | Kya hai cryptography ? | Explained in simple words

Channel: Technical Sagar & Total View: 60380

Add Date: December 7, 2016, 1:28 am & Duration: 00:05:14

Likes: 2061 | Dislike: 57


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Hello Dosto
Aaj hum baat karenge cryptography ke bare me ki ye kya hota hai aur iska itemaal kaise aur kaha hota hai. iska sambandh kisi bhi data ya message ko safely pohchane se hota hai aur uski security badhayi jati hai taaki bich me koi an-adhikarik tarike se usko access na kar paye. aasha karta hoo apko ye video pasand ayegi agar aapko ye video achhi lage to isse like kare aur apne dosto ke sath share kare aur abhi tak aapne mera channel subscribe nahi kia hai to jarur is channel ko subscribe kare.

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Lecture 1: Introduction to Cryptography by Christof Paar

Channel: Introduction to Cryptography by Christof Paar & Total View: 370499

Add Date: January 30, 2014, 1:27 am & Duration: 01:17:25

Likes: 2726 | Dislike: 64


Paar, Cryptography, Lecture

For slides, a problem set and more on learning cryptography, visit
The book chapter "Introduction" for this video is also available for free at the website (click "Sample Chapter").

Cryptography: The Science of Making and Breaking Codes

Channel: SciShow & Total View: 729376

Add Date: August 6, 2015, 12:02 pm & Duration: 00:08:21

Likes: 20669 | Dislike: 280


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There are lots of different ways to encrypt a message, from early, simple ciphers to the famous Enigma machine. But it’s tough to make a code truly unbreakable.

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What is Cryptography - Introduction to Cryptography - Lesson 1

Channel: Learn Math Tutorials & Total View: 74356

Add Date: July 12, 2014, 7:03 pm & Duration: 00:04:32

Likes: 586 | Dislike: 17


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In this video I explain the fundamental concepts of cryptography. Encryption, decryption, plaintext, cipher text, and keys.

Learn Math Tutorials Bookstore

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Public Key Cryptography - ComputerphilePublic Key Cryptography - Computerphile
00:06:20July 22, 2014, 7:59 am
Public Key Cryptography - Computerphile

Channel: Computerphile & Total View: 373716

Add Date: July 22, 2014, 7:59 am & Duration: 00:06:20

Likes: 8496 | Dislike: 112


computers, computerphile, Public-key Cryptography, Cryptography (Software Genre), computer, computer science, secrets, university of nottingham

Spies used to meet in the park to exchange code words, now things have moved on - Robert Miles explains the principle of Public/Private Key Cryptography

note1: Yes, it should have been 'Obi Wan' not 'Obi One' :)
note2: The string of 'garbage' text in the two examples should have been different to illustrate more clearly that there are two different systems in use.

This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham:

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at:

Quantum Cryptography ExplainedQuantum Cryptography Explained
00:08:13March 1, 2016, 3:37 pm
Quantum Cryptography Explained

Channel: Physics Girl & Total View: 245581

Add Date: March 1, 2016, 3:37 pm & Duration: 00:08:13

Likes: 8473 | Dislike: 163


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This episode is brought to you by Squarespace:

With recent high-profile security decryption cases, encryption is more important than ever. Much of your browser usage and your smartphone data is encrypted. But what does that process actually entail? And when computers get smarter and faster due to advances in quantum physics, how will encryption keep up?

Help us translate our videos!

Creator/Editor: Dianna Cowern

Writer: Sophia Chen

Animator: Kyle Norby

Special thanks to Nathan Lysne


Music: APM and YouTube

Asymmetric encryption - Simply explainedAsymmetric encryption - Simply explained
00:04:40October 30, 2017, 1:00 am
Asymmetric encryption - Simply explained

Channel: Simply Explained - Savjee & Total View: 68690

Add Date: October 30, 2017, 1:00 am & Duration: 00:04:40

Likes: 2436 | Dislike: 23


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How does public-key cryptography work? What is a private key and a public key? Why is asymmetric encryption different from symmetric encryption? I'll explain all of these in plain English!

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History of CryptographyHistory of Cryptography
00:06:14December 12, 2013, 9:53 am
History of Cryptography

Channel: shaan1111 & Total View: 7095

Add Date: December 12, 2013, 9:53 am & Duration: 00:06:14

Likes: 36 | Dislike: 3

Brief History of Cryptography

What is cryptography? | Journey into cryptography | Computer Science | Khan Academy

Channel: Khan Academy & Total View: 749592

Add Date: March 27, 2012, 5:28 pm & Duration: 00:01:31

Likes: 1206 | Dislike: 33


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What is Cryptography? A story which takes us from Caesar to Claude Shannon.

Watch the next lesson:

Missed the previous lesson?

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,...

Visual CryptographyVisual Cryptography
00:08:27March 4, 2014, 7:02 am
Visual Cryptography

Channel: Matt Donato & Total View: 23006

Add Date: March 4, 2014, 7:02 am & Duration: 00:08:27

Likes: 192 | Dislike: 3


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Hiding your images in style since 1994.

Copyright Protection Scheme for Digital Images Using Visual Cryptography and Sampling Methods
Ching-Sheng Hsu
Young-Chang Hou
July 2005

Image Processing & Computer Vision II

Cryptography Lesson #1 - Block CiphersCryptography Lesson #1 - Block Ciphers
00:04:17June 10, 2015, 4:08 pm
Cryptography Lesson #1 - Block Ciphers

Channel: Ryan Kral & Total View: 93861

Add Date: June 10, 2015, 4:08 pm & Duration: 00:04:17

Likes: 683 | Dislike: 27


Block Cipher, Cryptography (Software Genre), Tutorial (Media Genre)

This tutorial video will help provide an understanding of what block ciphers are, and how they are used in the field of cryptography.

James Lyne: Cryptography and the power of randomness

Channel: TEDTalentSearch & Total View: 35600

Add Date: June 26, 2012, 9:04 am & Duration: 00:05:22

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James Lyne is the Director of Technology Strategy at Sophos, a research firm concerned with cyber security. He works with law enforcement and other defense organizations at the forefront of data protection.
[Note: We want you to see these talks exactly as they happened! The archive footage might be a little rougher than the usual talk.]

I Hired A Cryptographer To Expose My Deepest SecretI Hired A Cryptographer To Expose My Deepest Secret
00:10:51October 28, 2017, 8:00 am
I Hired A Cryptographer To Expose My Deepest Secret

Channel: BuzzFeedBlue & Total View: 4132203

Add Date: October 28, 2017, 8:00 am & Duration: 00:10:51

Likes: 70076 | Dislike: 3071


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Will Mike's secret be exposed or remain hidden?

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Encryption and HUGE numbers - NumberphileEncryption and HUGE numbers - Numberphile
00:09:22December 9, 2012, 3:58 am
Encryption and HUGE numbers - Numberphile

Channel: Numberphile & Total View: 955077

Add Date: December 9, 2012, 3:58 am & Duration: 00:09:22

Likes: 15979 | Dislike: 213


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Banks, Facebook, Twitter and Google use epic numbers - based on prime factors - to keep our Internet secrets. This is RSA public-key encryption.
More links & stuff in full description below ↓↓↓

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This video features Dr James Grime ( Message from James: "Thanks to Dr Chris Hughes of the University of York who showed me how to find the RSA public key from my browser, and showed me how awesome they look when you print them out."

Regarding the keys used for encryption:
x, y prime
Encode key E shares no factors with (x-1)(y-1)
Decode key is D with E*D - 1 a multiple of (x-1)(y-1)

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Elliptic Curve Cryptography OverviewElliptic Curve Cryptography Overview
00:11:29October 14, 2015, 4:02 am
Elliptic Curve Cryptography Overview

Channel: F5 DevCentral & Total View: 112791

Add Date: October 14, 2015, 4:02 am & Duration: 00:11:29

Likes: 1513 | Dislike: 100


devcentral, Elliptic Curve Cryptography, Transport Layer Security (Protocol)

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:

A Short History of Cryptography - A Brief History of Cryptography

Channel: fb & Total View: 28744

Add Date: August 7, 2012, 9:33 pm & Duration: 00:44:55

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Short, History, Cryptography, Brief

A Short History of Cryptography - A Brief History of Cryptography

Public Key Cryptography: RSA Encryption Algorithm

Channel: Art of the Problem & Total View: 456131

Add Date: July 30, 2012, 3:01 pm & Duration: 00:16:31

Likes: 6628 | Dislike: 84


rsa, rsa encryption, rsa public key encryption, rsa algorithm, euler's theorem, euler's phi function, time complexity, cryptography

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:

How to Break Cryptography | Infinite SeriesHow to Break Cryptography | Infinite Series
00:15:37April 20, 2017, 12:42 pm
How to Break Cryptography | Infinite Series

Channel: PBS Infinite Series & Total View: 157829

Add Date: April 20, 2017, 12:42 pm & Duration: 00:15:37

Likes: 4353 | Dislike: 79


math, mathematics, education, science, cryptography, encryption, security, prime numbers, primes, factoring, factor, hack, break, crack, shor''s, algorithim

Only 4 steps stand between you and the secrets hidden behind RSA cryptography. Find out how to crack the world’s most commonly used form of encryption.

Tweet at us! @pbsinfinite
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Email us! pbsinfiniteseries [at] gmail [dot] com

Previous Episode:
Can We Combine pi & e into a Rational Number?

Links to other resources:

Shor's paper:

Lecture on Shor's Algorithm:

Blog on Shor's algorithm:

Video on RSA cryptography:

Another video on RSA cryptography:

Euler's Big Idea: (I can find a non-wiki article, but I don't actually use this in the video. It's just where to learn more about the relevant math Euler did.)

Written and Hosted by Kelsey Houston-Edwards
Produced by Rusty Ward
Graphics by Ray Lux
Made by Kornhaber Brown (

Challenge Winner - Reddles37

CISSP Training - CryptographyCISSP Training - Cryptography
00:29:19April 12, 2011, 11:16 am
CISSP Training - Cryptography

Channel: The Geek Academy & Total View: 191830

Add Date: April 12, 2011, 11:16 am & Duration: 00:29:19

Likes: 845 | Dislike: 26


isc2, cissp, cryptography, security training, security professional

This video on Cryptography (Part 1 of 3) is part of our CISSP certification Training Series. (ISC)2 CISSP certification is one of the top security certifications you can achieve, and our expert instructor walks you step by step trough all 10 domains in the CISSP Common Body of Knowledge (CBK).

Visit us at for full details about this amazing series.

Public key cryptography - Diffie-Hellman Key Exchange (full version)

Channel: Art of the Problem & Total View: 563218

Add Date: July 30, 2012, 5:00 pm & Duration: 00:08:38

Likes: 9014 | Dislike: 86


Diffie-Hellman Key Exchange, public key cryptography, diffie, cryptography, encryption, public key

The history behind public key cryptography & the Diffie-Hellman key exchange algorithm.
We also have a video on RSA here:

21. Cryptography: Hash Functions21. Cryptography: Hash Functions
01:22:01March 4, 2016, 2:12 pm
21. Cryptography: Hash Functions

Channel: MIT OpenCourseWare & Total View: 55028

Add Date: March 4, 2016, 2:12 pm & Duration: 01:22:01

Likes: 425 | Dislike: 19


hash function, random oracle model, cryptography, cryptographic function

MIT 6.046J Design and Analysis of Algorithms, Spring 2015
View the complete course:
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
More courses at

Keeping Secrets: Cryptography In A Connected WorldKeeping Secrets: Cryptography In A Connected World
01:26:02August 14, 2014, 12:17 pm
Keeping Secrets: Cryptography In A Connected World

Channel: World Science Festival & Total View: 61873

Add Date: August 14, 2014, 12:17 pm & Duration: 01:26:02

Likes: 420 | Dislike: 13


Keeping Secrets, Cryptography In A Connected World, science of Cryptography, enciphering messages, mathematics, computer science, electrical engineering, safeguards our privacy, internet privacy, Julian Assange, WikiLeaks, IP addresses, computational power increases, Numberphile, codebreaking, alan turing, Benedict Cumberbatch, Orr Dunkelman, Tal Rabin, Simon Singh, Brian Snow, Josh Zepps, New York, world, science, festival, NYC, New York City, full program, 2011

Josh Zepps, Simon Singh, Orr Dunkelman, Tal Rabin, and Brian Snow discuss how, since the earliest days of communication, clever minds have devised methods for enciphering messages to shield them from prying eyes. Today, cryptography has moved beyond the realm of dilettantes and soldiers to become a sophisticated scientific art—combining mathematics, physics, computer science, and electrical engineering. It not only protects messages, but it also safeguards our privacy. From email to banking transactions, modern cryptography is used everywhere. But does it really protect us? What took place was a discussion of cryptography’s far-reaching influence throughout history from Julius Caesar’s reign to Julian Assange’s WikiLeaks, and the ways in which it—and our privacy—are constantly under assault today as threats lurk behind IP addresses, computational power increases, and our secrets move online.

The World Science Festival gathers great minds in science and the arts to produce live and digital content that allows a broad general audience to engage with scientific discoveries. Our mission is to cultivate a general public informed by science, inspired by its wonder, convinced of its value, and prepared to engage with its implications for the future.

Introduction to Basic Cryptography: HashingIntroduction to Basic Cryptography: Hashing
00:20:34February 10, 2015, 3:45 am
Introduction to Basic Cryptography: Hashing

Channel: Ryan Riley & Total View: 20953

Add Date: February 10, 2015, 3:45 am & Duration: 00:20:34

Likes: 255 | Dislike: 1


Cryptography (Software Genre), Hash Function

Introduction to Basic Cryptography: Hashing

Cryptography Overview - CompTIA Security+ SY0-401: 6.1Cryptography Overview - CompTIA Security+ SY0-401: 6.1
00:08:31September 21, 2014, 11:06 am
Cryptography Overview - CompTIA Security+ SY0-401: 6.1

Channel: Professor Messer & Total View: 43395

Add Date: September 21, 2014, 11:06 am & Duration: 00:08:31

Likes: 135 | Dislike: 4


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Security+ Training Course Index:
Professor Messer’s Course Notes:
Frequently Asked Questions:
- - - - -
Our modern applications make extensive use of cryptography. In this video, you’ll learn the basics of cryptography and some of the history of ciphers and secrecy.
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Download entire video course:
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Dan Boneh: What is the future of cryptography?Dan Boneh: What is the future of cryptography?
00:04:53October 14, 2016, 2:44 pm
Dan Boneh: What is the future of cryptography?

Channel: Stanford University School of Engineering & Total View: 13849

Add Date: October 14, 2016, 2:44 pm & Duration: 00:04:53

Likes: 59 | Dislike: 1


encryption, cyber security, digital security, computer science, Stanford Engineering, cryptography

Dan Boneh talks about how he first became interested in encryption and the future of Internet security. Boneh is a Professor of Computer Science and of Electrical Engineering at Stanford and an expert in encryption and cyber security.

“I was fascinated with computers from a very young age. So, I just fell in love with these things that you can program them and tell them what to do and they just do it without arguing with you. It also became very clear that they're gonna hold a lot personal data about everyone, and it's kinda vital to protect that information somehow.”

22. Cryptography: Encryption22. Cryptography: Encryption
01:24:15March 4, 2016, 2:12 pm
22. Cryptography: Encryption

Channel: MIT OpenCourseWare & Total View: 13065

Add Date: March 4, 2016, 2:12 pm & Duration: 01:24:15

Likes: 87 | Dislike: 5


encryption, symmetric key encryption, key exchange, asymmetric key encryption, RSA, np-complete, graph coloring, knapsack problem

MIT 6.046J Design and Analysis of Algorithms, Spring 2015
View the complete course:
Instructor: Srinivas Devadas

In this lecture, Professor Devadas continues with cryptography, introducing encryption methods.

License: Creative Commons BY-NC-SA
More information at
More courses at

Learn Public Key Cryptography in just 18 Minutes - Cryptography Tutorial

Channel: & Total View: 26036

Add Date: December 9, 2016, 9:53 am & Duration: 00:18:07

Likes: 409 | Dislike: 21


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+++See my latest video: Internet Security or Die+++

Learn Public Key Cryptography in just 18 Minutes - Cryptography Tutorial

In this Cryptography Tutorial, I teach you Public Key cryptography basics. Specifically I’m going to explain to you how the cryptography works, that allows you to do online shopping. We are so used to online shopping, a.k.a. e-commerce, that we take it for granted. But e-commerce would not be possible at all without public key cryptography. Not only will I explained to you the details of public-key cryptography and how that makes e-commerce possible, but I’m going to explain it in 15 minutes, and explain it without math, by using the Blackbox model.

IMHO, cryptography basics should not include math. Cryptography explained with math simply muddies the waters to those without extensive math background.

Let’s start by taking a brief look at Classic cryptography, which is been around for thousands of years. Classic cryptography is also called secret key cryptography or Symmetric cryptography.

A cipher is some sort of a mathematical algorithm that we use to scramble text. In the blackbox model the cipher itself is the blackbox into which we input plaintext and the...

Stanford Seminar - The Evolution of Public Key Cryptography

Channel: stanfordonline & Total View: 890

Add Date: March 1, 2018, 12:28 pm & Duration: 01:14:30

Likes: 19 | Dislike: 0


Stanford, Stanford University, Seminar, ee380, Martin Hellman, Stanford EE, Public Key Cryptography, history, Cryptography, Electrical Engineering, NSA, evolution, Ralph Merkle, Whit Diffie

EE380: Computer Systems Colloquium Seminar
The Evolution of Public Key Cryptography
Speaker: Martin Hellman, Stanford EE (Emeritus)

While public key cryptography is seen as revolutionary, after this

talk you might wonder why it took Whit Diffie, Ralph Merkle and

Hellman so long to discover it. This talk also highlights the

contributions of some unsung (or "under-sung") heroes: Ralph Merkle,

John Gill, Stephen Pohlig, Richard Schroeppel, Loren Kohnfelder, and

researchers at GCHQ (Ellis, Cocks, and Williamson).

Resources and Reading Materials

M. E. Hellman, Cybersecurity, Nuclear Security, Alan Turing, and

Illogical Logic (

%7Ehellman/publications/77.pdf), Communications of the ACM, Vol. 60,

No. 12, pp. 52-59, December 2017.
This is a written version of Martin Hellman's ACM Turing Lecture

( and was accompanied by a

short (6 minute) video (

Other materials and hard to find references can be found on Martin

Hellman's Stanford website, .

About the...

Introduction to Cryptography and system security | CSS series #1

Channel: Last moment tuitions & Total View: 72113

Add Date: November 26, 2016, 1:09 am & Duration: 00:08:47

Likes: 749 | Dislike: 16


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Cryptography and security systems Series

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Cryptography 101 - Substitution CiphersCryptography 101 - Substitution Ciphers
00:11:12April 25, 2013, 5:50 pm
Cryptography 101 - Substitution Ciphers

Channel: Pico Cetef & Total View: 49980

Add Date: April 25, 2013, 5:50 pm & Duration: 00:11:12

Likes: 220 | Dislike: 11

In this video we look at substitution ciphers: how they are made and how to break them.

Bitcoin - Cryptographic hash functionBitcoin - Cryptographic hash function
00:10:14May 1, 2013, 8:12 pm
Bitcoin - Cryptographic hash function

Channel: Khan Academy & Total View: 204520

Add Date: May 1, 2013, 8:12 pm & Duration: 00:10:14

Likes: 463 | Dislike: 19

What cryptographic hash functions are and what properties are desired of them.
More free lessons at:

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.

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