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Crypto expert Elonka Dunin has discovered a steganographic message on the tombstone of William and Elizebeth Friedman.

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On Friday the Heinz Nixdorf Museum will broadcast a number of radio messages encrypted with an Enigma. Codebreaking experts in Bletchley Park will try to decipher these cryptograms with WW2 technology. Enigma experts will try the same with computer support.

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Two researchers have introduced new techniques for breaking Enigma messages. Using these techniques they have deciphered hitherto unsolved Enigma cryptograms from World War II.

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The Reihenschieber was a simple encryption device used by the Germans in the Cold War. I built a model of it with Lego bricks. Can you solve an encrypted text I produced with it?

Golden-Alice

Just like every end of year, I am awarding the Golden Alice for outstanding achievements in the field of crypto history.

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Enigmas are getting more and more expensive. In New York, a four rotor naval Enigma has now sold for almost half a million dollars.

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The first Enigma models were complex and expensive. Only when Enigma inventor Arthur Scherbius simplified the design of his machine it became practicable.

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In 1941 the German chemicals group Bayer sent an encrypted letter to Columbia. British codebreakers were able to decipher it.

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Around 1990 David Kahn, the father of crypto history, met a tall man wearing a suit and glasses. This is documented on a photograph. Does anybody recognize this man?

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In World War 2 the Germans used more than a dozen different cipher machines. A few more were developped but not used in practice. This article gives an overview.