Monday, April 30, 2018

Article on Chinese codes and ciphers

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Interesting article from the journal Cryptologia: ‘ Chinese cryptography: The Chinese Nationalist Party and intelligence management, 1927–19...
Friday, April 27, 2018

Cipher systems of the German Foreign Ministry

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The TICOM report IF-266 ‘ DEPARTMENT OF STATE REPORTS ON THE GERMAN FOREIGN OFFICE ’ has some information on the codebooks and cipher proced...
Wednesday, April 11, 2018

Another dead end?

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Last month i posted the recently declassified Carlson-Goldsberry report . A memo included in the report had the following handwritten notes:...
Saturday, March 31, 2018

The IBM Codatype cipher machine

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In the files of the NSA’s Friedman collection there is a report by William F. Friedman , dated September 1937, which deals with a cipher mac...
2 comments:
Tuesday, March 27, 2018

Essay by Frode Weierud on Inspectorate 7/VI cryptanalyst

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Who was Harry Welsch?
Monday, March 26, 2018

The Carlson-Goldsberry report - Compromise of State Department communications by the Finnish codebreakers in WWII

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During WWII the US State Department used several cryptosystems in order to protect its radio communications from the Axis powers. For low le...
1 comment:
Tuesday, March 6, 2018

Bye bye mr Hayashi

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In 2017 I tried to locate a file in the US national archives called ‘ Interrogation of mr Hayashi ’.  According to the NSA FOIA office i...
1 comment:
Saturday, February 24, 2018

Coldspur’s website

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I’ve added a link to Tony Percy’s website coldspur.com