Best Cryptography Videos
The 90 Cryptography videos here were recommended by different people across different months. Choose by who it is for: 9 introductory, 23 intermediate, 48 for a general viewer, and 10 for someone who wants the harder derivation. Most of them are a talk. What they share is that one speaker finishes a claim, and the examples exist to hold that claim up. Channels you will keep seeing include Computerphile, aantonop, Black Hat.

How secure is 256 bit security?
3Blue1Brown illustrates how enormous the 256-bit search space is, showing how infeasible it is to find a hash or key by guessing and checking.

"This Machine Greens" - Bitcoin Documentary - Online Premiere
A documentary from Swan Bitcoin exploring Bitcoin's relationship with energy, featuring Lyn Alden and others, and arguing that mining is a net positive for the environment and not wasteful.

How Does SHA-256 Work?
A step-by-step animated explanation of how SHA-256 works, from padding and message schedule to the compression function and final hash, with source code for the animations.

Moxie Marlinspike, Next Generation Threats 2014
Moxie Marlinspike speaks at Next Generation Threats 2014 about the challenges of encrypted communication and how Signal addresses them.

Lecture 7: Introduction to Galois Fields for the AES by Christof Paar
Christof Paar's university lecture introducing Galois fields and finite-field arithmetic as used in AES.

Peter Rizun, Andrew Stone -- 1 GB Block Tests -- Scaling Bitcoin Stanford.
Peter Rizun and Andrew Stone present results of tests running 1 GB blocks on a Bitcoin test network at Scaling Bitcoin Stanford.

Cracking Enigma in 2021 - Computerphile
Dr Mike Pound of Computerphile shows how a modern laptop can crack Enigma, using a ciphertext-only attack based on an older paper.

35C3 - The year in post-quantum crypto
Daniel J.

How Quantum Computers Break Encryption | Shor's Algorithm Explained
MinutePhysics explains Shor's algorithm, showing how a quantum computer factors large integers by finding the period of a number modulo N.

Andreas Antonopoulos - 51% Bitcoin Attack
A two-minute clip of Andreas Antonopoulos explaining why a 51% attack on Bitcoin would not destroy it and what such an attack would cost.

Brian Warner - Magic Wormhole- Simple Secure File Transfer - PyCon 2016.mp4
Brian Warner, author of magic-wormhole, presents the tool at PyCon 2016.

LibreSSL: The first 30 days, and what the Future Holds
Bob Beck of OpenBSD gives a BSDCan 2014 talk on the first month of LibreSSL, the OpenSSL fork.

Hacking at Quantum Speed with Shor's Algorithm | Infinite Series
PBS Infinite Series explains how Shor's algorithm lets a quantum computer break RSA encryption, building on earlier episodes about cryptography and the math of quantum computers.

Bitcoin Is Protecting Human Rights Around the World
A Reason TV segment, drawing on Alex Gladstein of the Human Rights Foundation, argues that Bitcoin works as an escape hatch for people living under authoritarian governments and inflating currencies.

Gopherfest 2017 | Upspin with Rob Pike
Rob Pike presents Upspin at Gopherfest 2017, an experimental framework for naming and sharing files and data securely and uniformly across a global namespace.

Here's Why Your Static Website Needs HTTPS
Troy Hunt argues that even static, non-secret websites need HTTPS, demonstrating attacks such as injected content and China's Great Cannon.

How I hacked a hardware crypto wallet and recovered $2 million
Joe Grand recounts being hired to hack a Trezor One hardware wallet and recover $2 million of cryptocurrency.

Honest Government Ad | Anti Encryption Law
A satirical 'honest' government ad from The Juice Media about Australia's 2018 Assistance and Access anti-encryption bill.

The Encryption Tightrope: Balancing Americans’ Security and Privacy: EventID=104573
A 2016 House Judiciary Committee hearing on encryption, held during the Apple and FBI iPhone dispute.

Saifedean Ammous: Bitcoin, Anarchy, and Austrian Economics | Lex Fridman Podcast #284
A long Lex Fridman podcast conversation with Austrian economist Saifedean Ammous, author of The Bitcoin Standard.

Diffie-Hellman Key Exchange
A short Art of the Problem clip explaining Diffie-Hellman key exchange, using a paint mixing analogy for one-way functions and touching on modular arithmetic and discrete logarithms.

Behind the scenes of iOS and Mac Security
Ivan Krstic's Black Hat talk on Apple platform security, including the Find My design that uses elliptic curve key diversification to locate offline devices privately.

27c3: Console Hacking 2010 (en)
The fail0verflow team (bushing, marcan, sven) present console hacking at 27C3, covering Wii, Xbox 360 and PS3 exploits.

36C3 - The ecosystem is moving
Moxie Marlinspike's 36C3 talk examines why distributed and decentralized technology is hard to build into consumer products, from the perspective of developing Signal.