The German military used the Geheimschreiber device to encode strategic communications. In 1940 Swedish mathematician Arne Beurling broke the code. Beckman (formerly the head of the cryptanalysis department of the Swedish signal intelligence agency) presents a narrative history of that achievement and other aspects of the Swedish code program that frequently strays into mathematical explanations of the cryptographic issues surrounding the story. Originally published in Swedish as Svenska kryptobedrifter . Annotation c. Book News, Inc., Portland, OR (booknews.com)

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Codebreakers: Arne Beurling and the Swedish Crypto Program During World War II (signed)

Bengt Beckman

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