Learn how to implement a classic substitution cipher in C! This step-by-step tutorial walks you through encoding and decoding ...

In Part I, you broke a simple cipher. Now try creating a more complex cipher. Cut out the NOVA Decoder Ring and NOVA Cipher Code Ring and the window marked INDEX. You are now going to put this simple ...

The Voynich manuscript has long been shorthand for the unsolved and the unknowable, a late medieval codex filled with looping ...

A unique cipher that uses playing cards and dice to turn languages into glyphs produces text eerily similar to the glyphs in ...

You have been chosen by the British Secret Service to be a member of Station X, the highly secret organization set up to decode German messages during WWII. To prove you are up to the job, decode this ...