10 Facts About Rotor machine

In cryptography, a rotor machine is an electro-mechanical stream cipher device used for encrypting and decrypting messages.

Primary component of a rotor machine is a set of rotors, termed wheels or drums, which are rotating disks with an array of electrical contacts on either side.

Rotor machine's technique looked for repeating patterns in the ciphertext, which provide clues about the length of the key.

Concept of a rotor machine occurred to a number of inventors independently at a similar time.

Rotor machine's success was limited and he went bankrupt in the 1920s.

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Rotor machine sold a small number of machines to the US Navy in 1931.

However, the rotor machine was ultimately made famous by Arthur Scherbius, who filed a rotor machine patent in 1918.

The Japanese PURPLE machine was not a rotor machine, being built around electrical stepping switches, but was conceptually similar.

Unique rotor machine called the Cryptograph was constructed in 2002 by Netherlands-based Tatjana van Vark.

Software implementation of a rotor machine was used in the crypt command that was part of early UNIX operating systems.