US crypto expert Jim Gillogly broke over 1,000 transposition cryptograms created by IRA activists in the 1920s. Only one of these messages remained unsolved. Now, it has been broken by Richard Bean from Brisbane, Australia.
In 1941, a sender in Hamburg, Germany, transmitted an encrypted message to a receiver in Rio de Janeiro, Brazil. The encryption method and the key are known, but the plaintext has not been completely deciphered yet.
Ignaz Meyer, a Bavarian teacher and town writer, wrote an encrypted diary. The content of this joural gives interesting insights into the life of a 19th century individual who had a drinking problem and was not very successful in his job.
An anamorphic is a puzzle based on a special kind of secret writing. Here are two postcards with anamorphic motives. Can you decrypt them?
The latest issue of the ACA newsletter “The Cryptogram” introduces an encrypted postcard. The cipher used is unusual. Can you solve it anyway?
A Canadian company hides treasures that can be found by solving puzzles. The first round of the hunt is over, a second one has been announced.
A new YouTube video shows two presentations given by Bernard Fabrot and Simon Pfeffers about how they solved LCS35. Another video shows the opening of the time capsule at the same event.
Blog reader Christof Rieber has solved the Ghostemane cryptogram, a crypto challenge published by a US music magazine. Here’s how he found the solution.
Blog reader Christoph Tenzer has solved the Rubik’s Cube challenge I introduced last October. His work is an amazing act of cryptanalysis.
Blog reader Matthias Axinger has drawn my attention to an encrypted message that played a role in the TV series “Operation Mozart”. Can you solve a cryptogram that was created with the same method?
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