Today’s Math Monday begins a multi-part series on the columnar transposition cipher.

We return to the series on columnar transposition ciphers to discuss permutations, how CTCs can be thought of as permutations, and some questions that this connection opens up.

Double Transposition Cipher Solution Back to Double Transposition Hint Normally the keys would be numbered like this: 11 1 1 1 81520194673 327811504692 MAHATUNDILA CULLATINDILA However, Agent ...

He explores polyalphabetic substitution ciphers, transposition ciphers, including one developed by the Spartans, connections between ciphers and computer encryption, stream ciphers, ciphers involving ...

The German police made the mistake in late 1941 of switching from the rather strong Double Transposition cipher to the more accessible Double Playfair, and for over a year Bletchley Park was able ...