Thursday, December 6, 2012

Typex operational procedures

A file in HW 40/89 ‘Investigation into POW reports that German Sigint authorities exploited TYPEX (British cypher machine)’ has details on the use of the Typex cipher machine.

Specifically the introduction of new rotors, detachable rotor cores (called inserts) and the rewirable reflector (called plugboard in the report):

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