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Every Japanese code was eventually broken, and the intelligence gathered made possible such operations as the victorious American ambush of the Japanese Navy at Midway in 1942 (by breaking code JN-25b) and the shooting down of Japanese admiral Isoroku Yamamoto a year later in Operation Vengeance.
Wilford in his Decoding Pearl Harbor: USN Cryptanalysis and the Challenge of JN-25B in 1941, suggests that this view is now untenable and that the JN-25 codes were readable to a great extent and hence, lends "support to the revisionist theories of Toland and Stinnett". LCDR Joseph J. Rochefort led and handpicked many of the key codebreakers at ...
Early on, a better tactical window was the Japanese Fleet Code (an encoded cypher), called JN-25 by U.S. Navy cryptanalysts. Breaking into the version in use in the months after December 7, 1941 provided enough information to lead to U.S. naval victories in the battles of the Coral Sea and Midway , stopping the initial Japanese advances to the ...
While many historians have insisted that Rochefort's team failed to crack the JN-25B, Naval code the declassified intercepts refute the notion. In August 1970, Safford reaffirmed his views: "By Dec.1/41, we had the code solved to a readable extent."(Wilford, Decoding Pearl Harbor: USN Cryptanalysis and the Challenge of JN-25B in 1941).
The first 100 JN-25 decrypts from all sources in date/time order of translation have been released, and are available in the National Archives. The first JN-25B decrypt was in fact by HYPO (Hawaii) on January 8, 1942 (numbered #1 up JN-25B RG38 CNSG Library, Box 22, 3222/82 NA CP). The first 25 decrypts were very short messages or partial ...
The LA code was a low-grade code for consular messages, and was broken by the Sydney University group of Monterey codebreakers in 1941 before they moved to FRUMEL. Athanasius Treweek said, "there were several grades of diplomatic code, and they came to pieces fairly easily. The LA code was called that because every message began with the ...
Joseph John Rochefort (May 12, 1900 [1] – July 20, 1976) was an American naval officer and cryptanalyst.He was a major figure in the United States Navy's cryptographic and intelligence operations from 1925 to 1946, particularly in the Battle of Midway.
In electric power systems and industrial automation, ANSI Device Numbers can be used to identify equipment and devices in a system such as relays, circuit breakers, or instruments. The device numbers are enumerated in ANSI / IEEE Standard C37.2 Standard for Electrical Power System Device Function Numbers, Acronyms, and Contact Designations .
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