Lectures

Encoding | Simple Ciphers

Four's diary entries

Encoding: 1 | 2 | 3 | 4 | 5
Simple Ciphers: 6 | 7 | 8 | 9 | 10 | 11

Resources

ASCII: Table
Caesar: wheel (JavaScript) | wheel (png) | wheel (psd)
Vigenere: Table
EXIF: Metadata tool
Enigma: Emulator | Keys