During World War II a woman from Loiret, France, sent an encrypted message to a recipient in Nantes, France. Can a reader break this cryptogram?
The longest key ever publicly broken by exhaustive key search has 64 bits. A challenge I created a few years ago aims to improve this world record by one bit.
ADFGVX is an encryption method used by the Germans in WW1. Some 20 ADFGVX radio messages from 1918 are still unsolved.
In 1999 cryptographer Ron Rivest published an encrypted text that was designed to take 35 years to break. 18 years later it is still unbroken.
Substituting letter pairs (bigrams) is an encryption method that was already known in the 16th century. Is it still secure today?
Seven Chinese goldbars from the 1930s bear encrypted inscriptions that have never been deciphered. The provenance of these goldbars is a mystery, too.
Today, I’m starting a new series on Klausis Krypto Kolumne. I’m going to present the 50 most important unsolved cryptograms. Number 50 is the Cylob cryptogram, a truly mysterious book.
Tengri 137 is the name of a mystery game, in the center of which is an encrypted book. The last seven pages of this book still wait to be deciphered.
Within a few hours, blog reader Norbert Bierman solved the Reihenschieber challenge I introduced last Monday. His work shows that I used this device in a wrong way.
For the second time in a few months, an encrypted bottle post has been found in the river Alster in Hamburg. Can a reader decipher these mysterious messages? Can we find out who is behind these bottle posts?
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