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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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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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Israeli codebreaker and reader of this blog, George Lasry, has solved cryptogram #42 from my top 50 list.

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Three weeks ago I introduced Ernest Rinzi’s encrypted journal – one of the most spectacular cryptograms I have ever seen. London-based codebreaker Tony Gaffney has now broken a large part of the cipher. Maybe a reader fluent in Italian can fill in the gaps and supply a translation.

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A few weeks ago I introduced two unsolved encrypted letters from the Thirty Years’ War. Scientist and blog reader Thomas Ernst has deciphered them now.

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A 17th-century Italian nun claimed that the Devil had dictated an encrypted letter to her. Scientists have now allegedly broken this cryptogram. Details are not known yet.

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Some of the crypto mysteries I recently introduced on this blog were quite tough. As a change, here are a few easier ones from a 19th century children’s magazine.

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Italian cryptologist Luigi Sacco left behind a text encrypted with a Fleissner grille. Paolo Bonavoglia and Bart Wenmeckers, both readers of this blog, solved it.

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In a British censorship manual from WW2 two pictures containing hidden messages are displayed. My readers have now found at least a part of the solutions.

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Three weeks ago I blogged about an encrypted telegram that was sent from New York to Tel Aviv in 1948. This cryptogram has now been solved.