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Japanese naval codes

Known as: JN-25, JN-25b 
The vulnerability of Japanese naval codes and ciphers was crucial to the conduct of World War II, and had an important influence on foreign relations… Expand
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Papers overview

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2019
2019
Abstract By the end of 1943, US Navy mathematician/codebreaker Marshall Hall Jr. had developed a system of statistical weights to… Expand
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2015
2015
Abstract A postwar report shows that during World War II, OP-20-GM, the research section of Naval Communications, planned and the… Expand
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2014
2014
Abstract During World War II, The National Cash Register Company built an additive recovery machine for the U.S. Navy. The… Expand
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2014
2014
Increases in the complexity of the JN-25 cipher systems from 1939 to 1943 must have suggested that developing new techniques in… Expand
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2014
2014
By late 1941, sufficiently many book groups in the JN-25B code book had been found to enable the compilation of an accurate list… Expand
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2014
2014
The JN-25 series of IJN operational codes was the most important source of Allied Sigint throughout the Pacific War. From early… Expand
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2012
2012
Abstract From 1939 to 1945 the Imperial Japanese Navy made heavy use of a series of additive cipher systems generically named JN… Expand
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2006
2006
Abstract This is the text of a speech by CAPT Forrest R. “Tex” Biard (Ret) given to the National Cryptologic Museum Foundation on… Expand
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2006
2006
ABSTRACT This article analyses the process by which the indicator encryption system of the Japanese Army Water Transport Code… Expand
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1998
1998
A popular rumor about the Japanese defeats at the Battles of Coral Sea and Midway is that codebooks for JN-25 (Angosho D) had… Expand
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