To decode the cipher at the terminal in the basement in Black Ops 6, you will need to follow a simple technique.

Her duress code was to use a double transposition key with precisely 18 letters, so we know this message was not sent under duress.

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.