To decrypt a double transposition, construct a block with the right number of rows under the keyword, blocking off the short columns. Write the cipher in by columns, and read it out by rows.

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.

Oranchak, a 46-year-old software developer in Virginia, said the 340 is what’s known as a transposition cipher. Most ciphers used today by computers rely on mathematics to scramble messages.

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 ...