Of the five rotors, typically the first two were stationary. On a Typex rotor, each electrical contact was doubled to improve reliability. Like the Enigma, the signal was sent through the rotors twice, using a "reflector" at the end of the rotor stack. Typex came in a number of variations, but all contained five rotors, as opposed to three or four in the Enigma. The cipher machine (and its many revisions) was used until the mid-1950s when other more modern military encryption systems came into use. It was an adaptation of the commercial German Enigma with a number of enhancements that greatly increased its security. In the history of cryptography, Typex (alternatively, Type X or TypeX) machines were British cipher machines used from 1937. This model, a Typex 22, was a late variant, incorporating two plugboards. Typex was based on the commercial Enigma machine, but incorporated a number of additional features to improve the security.
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