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18-year-old chemistry student Paul Rubin was found dead with a cyanide poisoning in 1953. In his possession police found an encrypted message. This cryptogram has never been deciphered.

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English actress Diana Dors left behind an encrypted message. This cryptogram allegedly leads to two million pounds.

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Today’s crypto mystery is about a postcard written to a noblewoman in 1914. Can a reader solve it?

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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.

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Two encrypted letters written by Spanish king Ferdinand II of Aragon baffled historians. Thanks to secret service codebreakers, the mystery is now solved.

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

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Four episodes of the Zodiac Killer documentary on HISTORY have aired now. The fourth one ended with Craig Bauer saying that he has broken Z340. Will episode 5 tell us the solution?

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Two years ago I blogged about an encrypted certificate, which was found in the wall of a house. Nobody could solve this cryptogram. So, it’s time to have a second look at it.

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A reader from the Philippines has asked me for help. Can somebody solve the crypto puzzle he is currently working on?

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An M4 Enigma from World War II has set a new world record price at a Christie’s auction in New York.