Alan Turing Cryptanalysis Papers:
GCHQ, the UK government's communications headquarters, has released two new -- well, 70 years old, but new to us -- cryptanalysis documents by Alan Turing.
The papers, one entitled The Applications of Probability to Crypt, and the other entitled Paper on the Statistics of Repetitions, discuss mathematical approaches to code breaking.[...]
According to the GCHQ mathematician, who identified himself only as Richard, the papers detailed using "mathematical analysis to try and determine which are the more likely settings so that they can be tried as quickly as possible."
The papers don't seem to be online yet, but here's their National Archives data.
(Via Schneier on Security)
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