The Playfair cipher is an incredibLe code system that is both difficult to decrypt without a computer and easily solvable by hand. You might be familiar with the Cryptoquip in the comics section of a ...

The mechanics of the Double Playfair are involved enough that it is expected that solving this cipher would be most readily achieved by a computer program that recovers the first square by shifting ...

This cipher is quite difficult with the amount of information available here. Wartime cryptanalysts expected to be able to solve for the keywords after 150 to 200 plaintext-ciphertext pairs were ...