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In 1934, a US magazine published an encrypted message a reader had found in an old document. The solution is not known to me.
The Playfair cipher is an encryption method from the 19th century. Some say that a Playfair-encrypted message of 50 or less letters is still secure today, if the method is used properly. Let’s put this claim to the test.
Victor Lustig (1890-1947), “the man who sold the Eiffel tower”, was a successful con artist. In 1935, master codebreaker William Friedman was asked to break an encrypted message Lustig had in his possession.
US crypto collector Marc Sachs has shown me a Burst Encoder from the 1950s. A video explains how this cleverly designed device works.
In 1863, during the US Civil War, a Union soldier wrote a letter to an unknown recipient. This letter is encoded in a shorthand, probably Pitman. Can a reader decipher it?
In 1948, an anonymous codebreaker deciphered an encrypted message by British parapsychologist Robert Thouless. The solution is known. Can a reader find out how the successful attack worked?
The US Navy cryptologists use a logo that contains an encrypted message. Can a reader decipher it?
US outsider artist James Hampton (1909-1964) created only one notable piece of art. In addition, he left behind over 100 pages of encrypted notes that are unsolved to date.
Last year, press reports said that the Devil’s Letter, a notable Italian cryptogram, was solved. It was a good example of how fake news are born.
The challenges of Giouan Battista Bellaso were one of the top unsolved crypto mysteries. Norbert Biermann has now published the last two parts of the solution.
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