Klaus Schmeh
In a well-known codebreaking book from the 1930s, a Playfair-encrypted message with a (probably fictive) background story is provided. Can a reader break this cipher?
A Reddit user has found two encrypted notes and a few geographic coordinates in an old travel book. Can a reader find out what these messages mean?
Anamorphics are puzzles based on a kind of secret writing. Here are a few examples, some of which are over 100 years old.
Blog reader Magnus Ekhall has taken a trip to the Rök runestone, a famous cryptologic sight in Sweden. Here are his report and a few photographs he took.
In 1999 cryptographer Ron Rivest published an encrypted text that was designed to take 35 years to break. Apparently, it has now been solved.
A statue in a northern German church bears an inscription nobody can read. What looks like Hebrew, might be encrypted. Can a reader make sense of this cryptogram?
In WW2, Berlin-based company Heimsoeth & Rinke not only produced the Enigma, but also a cipher cylinder, about which as good as nothing is known. Can my readers help to research the history of this device?
In 1875, a man living in Vienna received an encrypted postcard from a family member. Can you break this cryptogram?
British comedian Chris Sievey, also known as Frank Sidebottom, left behind a number of encrypted messages. British Codebreakers deciphered them and will publish the solutions in a few days. Can a reader break these cryptograms beforehand?
In the 19th century, a sailor working on the Great Lakes kept an encrypted diary. Can a reader decipher it?
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