Double Transposition Cipher
The double transposition cipher (AKA double columnar transposition) was used by military forces in World War I and II. It is basically a columnar transposition followed by another columnar transposition. It is considered one of the most secure ciphers that can be performed by hand.
Enter the key and click decode or encode to show.
The following buttons can be used to manipulate the text into various forms such as uppercase, lowercase, reverse text, etc. The choice text chosen will be copied and a new page will be opened.