Blog reader Tony Gaffney has provided me a strange drawing from a British archive. Does it code a text? Is it a cipher tool? Any help from my readers is welcome.
A gamer has offered a reward for solving two ciphers appearing in a video game. This gives you the chance to make money on your codebreaking skills.
The Fleissner grille is one of the most popular encryption tools. In spite of its popularity, surprisingly little has been published about deciphering a Fleissner grille. I wonder if a reader can break the Fleissner challenge I am going to present today.
An old French magazine mentions an encrypted message that was found in the estate of a 19th century French soldier. Can a reader decipher this cryptogram?
The new year begins with six encrypted postcards from the 19th century. They were provided to me by the National Cryptologic Museum. Can a reader decipher them?
Klausis Krypto Kolumne wishes everybody a Merry Christmas! In case you find some spare time over the holidays, try to solve this encrypted Christmas card from the early 20th century.
In 1905 a woman named Elena Moga received an encrypted postcard. Can a reader break this cryptogram?
In the 1920s a woman named Grace Gull wrote a diary. For some text passages she used a secret code. Can a reader break it?
In 1906, an unknown person sent two beautiful postcards encrypted in a pigpen cipher to a man in Kent. Can a reader solve these two postcard cryptograms?
An Italian website reports on an encrypted notebook written by a 16th century nun. The encryption is unsolved. Can a reader help to shed some more light on this crypto mystery?
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