Abstract

This article explores conventions used by the Government Code and Cypher School (GC&CS) in Britain and the U.S. Navy's OP-20-G in the United States to describe and correct Enigma wiring data recovered cryptanalytically during World War II. Examples are presented and analyzed using wiring information for several machines attacked by the ISK (Intelligence Services–Knox) section of GC&CS and by Unit 387 (the cryptanalytic unit of the United States Coast Guard, absorbed into the U.S. Navy's OP-20-G during the war).

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