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Analog of the Japanese Type B Cipher Machine (codenamed Purple) built by the U.S. Army Signal Intelligence Service Purple analog equipment in use. The "System 97 Typewriter for European Characters" (九七式欧文印字機 kyūnana-shiki ōbun injiki) or "Type B Cipher Machine", codenamed Purple by the United States, was an encryption machine used by the Japanese Foreign Office from February ...
A copy of the code book was obtained in a "black bag" operation on the luggage of a Japanese naval attaché in 1923; after three years of work Agnes Driscoll was able to break the additive portion of the code. [2] [3] [4] Knowledge of the Red Book code helped crack the similarly constructed Blue Book code. [1]
For eighteen months, she worked with other SIS codebreakers to analyze the encryption system used in the Japanese Type B Cipher Machine, code named Purple by the SIS [3]: p. 8 She played a key role in cracking the cipher, [4] discovering cyclical behavior in the code on September 20, 1940.
PURPLE was an enticing, but quite tactically limited, window into Japanese planning and policy because of the peculiar nature of Japanese policy making prior to the War (see above). Early on, a better tactical window was the Japanese Fleet Code (an encoded cypher), called JN-25 by U.S. Navy cryptanalysts.
The U.S. called this the "Purple" code, because they kept intercepted traffic in purple binders. Although the Japanese purchased the Enigma machine, they chose to base their cipher machine on a different technology, using a stepping switch rather than several rotors. [20]
Rowlett found a method to read the messages enciphered on the Japanese PURPLE machine. Rosen deduced correctly the mechanism of the cipher machine, even though the mechanism used by PURPLE, telephone stepping switches, was substantially different from other machines (such as the wired rotor and pinwheel machines). [1] [additional citation(s ...
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[16] [17] [18] Office Mobile 2010, an update to Microsoft's mobile productivity suite was released on May 12, 2010 as a free upgrade from the Windows Phone Store for Windows Mobile 6.5 devices with a previous version of Office Mobile installed. [19] [20] [21] Office 2010 is the first version of Office to ship in a 64-bit version.