Purple

In the history of cryptography, 97-shiki-obun In-ji-ki (九七式欧文印字機) ("System 97 Printing Machine for European Characters") or Angooki Taipu B (暗号機B型) ("Type B Cipher Machine"), codenamed PURPLE by the United States, was a diplomatic cryptographic machine used by the Japanese Foreign Office during, and just before, World War II. The machine was an electromechanical stepping-switch device.

Related Topics:
History of cryptography - Codename - United States - Cryptographic - Japan - World War II - Stepping-switch

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The codename of PURPLE referred to binders used by US cryptanalysts for material produced by various systems; there had been a RED machine used by the Japanese Foreign Office, and purple was the next available color. The Japanese also used CORAL and JADE stepping-switch systems. The PURPLE machine was a successor to, and improvement on, both the RED machine and what the Americans called the "M machine" (used in some embassies and consulates by attachés). All were designed by Japanese Navy Captain Risaburo Ito. The information gained from decryptions was eventually code-named Magic within the US government.

Related Topics:
RED - CORAL - JADE - Magic

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