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Heath Robinson was a machine used by British codebreakers at the Government Code and Cypher School (GC&CS) at Bletchley Park during World War II in cryptanalysis of the Lorenz cipher. This achieved the decryption of messages in the German teleprinter cipher produced by the Lorenz SZ40/42 in-line cipher machine.
A 2012 London Science Museum exhibit, "Code Breaker: Alan Turing's Life and Legacy", [102] marking the centenary of his birth, includes a short film of statements by half a dozen participants and historians of the World War II Bletchley Park Ultra operations. John Agar, a historian of science and technology, states that by war's end 8,995 ...
A code-break procedure is a set of rules which determine when planned unblinding should occur in a blinded experiment. FDA guidelines recommend that sponsors of blinded trials include a code-break procedure in their standard operating procedure .
Codebreakers tried to break PURPLE communiques by hand but found they could not. Then the codebreakers realized that it was not a manual additive or substitution code like RED and BLUE, but a machine-generated code similar to Germany's Enigma cipher. Decoding was slow and much of the traffic was still hard to break.
U.S. Army Signals Intelligence Service cryptologists, mostly women, at work at Arlington Hall circa 1943. The Code Girls or World War II Code Girls is a nickname for the more than 10,000 women who served as cryptographers (code makers) and cryptanalysts (code breakers) for the United States Military during World War II, working in secrecy to break German and Japanese codes.
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US Navy bombe at the National Cryptologic Museum. Partial schematics of the US Navy bombe.. The United States Naval Computing Machine Laboratory (NCML) was a highly secret design and manufacturing site for code-breaking machinery located in Building 26 of the National Cash Register (NCR) company in Dayton, Ohio and operated by the United States Navy during World War II.
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