Playfair Cipher
17:09
Paper Enigma Machine
12:49
Playfair Cipher (Part 1)
10:23
The Mystery of the Copiale Cipher
15:33
Cryptanalysis of Vigenere cipher: not just how, but why it works
23:16
Cracking a Playfair code
12:51
I Can Twist My Eye Around Its Pupil (And So Can You)
21:31
How to Use a Playfair Cipher to Encode and Decode a Secret Message
7:31