Tuesday, March 9, 2010

Rotor Machine Cipher

Rotor Machine cipher is a substitution cipher which falls under the subcategory of polyalphabetic substitution ciphers.

What is a rotor machine?
Rotor machine is an electro-mechanical equipment used to encrypt and decrypt plaintext to ciphertext in cryptography which was widely used in the 1930s-1950s. One of the most common implementation of rotor machine is Enigma machine which is shown below.

How Rotor Machines Operate
Recommended reference to understand the operation of rotor machine is given below.
http://www.cleavebooks.co.uk/trol/trolc07.pdf

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