Scytale Cipher

Scytale Encryption uses a cylinder and a band characterized by its number of turns L of the band around the cylinder.

Example: Code DCODE with a band L=3.

The message is written along the cylinder, one letter per band, and when the end is reached, go to a new line.

If needed, complete the last line with another character, e.g. X or _.

Example:

The ciphered message is the band unrolled, (i.e the message read by column).

Example: The cipher text is DDCEO_

Scytale Decryption requires to know the number N of letters by turn of the band (the size of the cylinder), or L the number of turns around the cylinder.

Example: The ciphertext is DDCEO_ (6-character long) and the band is L=3, then N=2 (because 6/3=2).

Write the message on the band and wraps the band around the cylinder (of correct size) and the plain text should appear.

Example:

To make a real scytale, the parchment ribbon and rolled top-down around a wooden cylinder (a solid stem or a regular wood branch).

The Plutarch's staff is the other name given to the Scytale, because the philosopher Plutarch is one of the first to have described this encryption process.

The coincidence index is equal to the one of the original text (as it is a transposition cipher).

The plutarch's staff is the name given to an album of Blake and Mortimer.

One can crack Scytale by testing all possible size of the rectangle.

Scytale is a practical application of the Caesar Cipher.

8 to 6 centuries BC even if Plutarch describes it only 1 century BC