In 1913, an unknown person sent an encoded postcard to a man living in the then German town of Nieder-Jeutz. It is not possible to decipher this card unambiguously, but a few guesses can be made.
Once again, an unsolved cryptogram has been published on Reddit. No details are provided. It is not even clear what is above and what below. Can a reader solve this mystery?
Three years ago, US codebreaker Gary Klivans provided me a screenshot that shows a seemingly random sequence of letters created by a criminal. So far, nobody has been able to make sense of this cryptogram.
Siegfried Schwabl (born 1917) from the Salzburg area, Austria, wrote an encrypted diary. The solution is known, but has not been published. Can a reader decipher the diary excerpt that is available online?
An Austrian museum association has asked its Twitter followers to help deciphering an old postcard. So far, no solution has been tweeted. Can a reader of this blog solve this mystery?
Martin Gardner, one of the world’s most renowned science journalists, dedicated one of his books to a certain OSVVZ ZYTZC KJLQZ. Can a reader decipher this encrypted name?
A dead man who was found in Australia in 1948 has never been identified. An encrypted (?) text could help solve the mystery. But nobody has been able to decipher it yet.
The lyrics of the song “Encryption D” by techno musician AVTechNO! reads like an encrypted message. Can a reader break it?
German adventurer and explorer Philip von Hutten (1505-1546) left behind an encrypted note that has never been deciphered. Can a reader of this blog solve this mystery?
Here are a few more encrypted texts Peter Nüchterlein, the writer-in-residence in Wernigerode, Germany, has found in a Vienna archive. Can a reader decipher them?
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