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

It’s Math Monday! In this third post in a series on columnar transposition ciphers, we look at a formula for the underlying permutation of a CTC and specialize it to the rail fence cipher.

This is Sparta! The Scytale ; Rails and routes: geometric transposition ciphers ; Permutations and permutation ciphers ; Permutation products ; Keyed columnar transposition ciphers ; Determining the ...