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

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. > Skip to content ...

The Double Transposition Cipher ... Columnar transposition works like this: First pick a keyword, such as DESCRIBE, then write the message under it in rows: D E S C R I B ...

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 ...