7:07
ADFGVX Cipher: Encryption and Decryption (OLD VERSION: SEE NEW VERSION LINK BELOW)
Proof of Concept
15:33
Cryptanalysis of Vigenere cipher: not just how, but why it works
26:06
Lehmer Factor Stencils: A paper factoring machine before computers
8:14
ADFGVX Cipher: Encryption and Decryption (Updated)
6:10
The Intuition behind the Double-And-Add / Square-And-Multiply Algorithm (Also Just a Fun Puzzle!)
