Decipher This
An 10-year unsolved death, the only clues are coded messages in the victim’s pocket. You can help!
The Taman Shud Mystery
Another code, another mystery.
The Enigma
Read about codebreaking on the BBC website.
Paper Trail
A secret code to track your printing.
11 Legendary Unsolved Ciphers
Fascinating.
Create your own secret codes
Roll your own.