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.

Another is to employ a transposition cipher, in which the letters change position within the message. In this interactive, explore examples of a substitution cipher and two kinds of transposition ...

After reviewing the terms with students, write a different one-line cipher on the board, using the above key, for the class to solve. Write substitution and transposition ciphers.

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

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