The PURPLE Machine simulator | Search for a title, author or keyword | ||||||||
The PURPLE Machine simulator PURPLE was the designation given by U.S. cryptanalysts to the cipher machine used by the Japanese Foreign Office for secure communications before and during WW 2: one of the first examples of mechanical enciphering procedures. The structure and internal wiring of the machine, as well as details of the keying procedures and systems of abbreviations used in PURPLE messages are described in the paper ( PDF format ): Cryptologia, Freeman, Wes., Geoff Sullivan, and Frode Weierud, 2003. The 97-shiki-obun In-ji-ki (Cipher Machine 97) was also referred to as Angooki Taipu B by the Japanese. When cryptanalysis of the PURPLE machine began, the American cryptanalysts also referred to it as the “B Machine.” However, it did not seem prudent to use the Japanese designation so a ‘cover name’ of PURPLE was adopted. Learn how to decipher an actual PURPLE message and get instructions on how to decipher ( or to encipher ) the message with a PURPLE simulator for Windows 3.1/95/98/NT4 ( and XP ). The .exe file is about 150 Kb. All Software Copyright 1997-2000 Geoff Sullivan.
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