Devils-Letter-2-bar

Last year, press reports said that the Devil’s Letter, a notable Italian cryptogram, was solved. It was a good example of how fake news are born.

Postcard-Bristol-bar

In the last decade of the 19th century, an unknown person sent three encrypted messages from a place named Bristol. Can a reader decipher these messages?

Postcard-Hanford-bar

My readers are pretty good at solving encrypted postcards. However, the two specimens I am going to introduce today look pretty hard to decipher, as the messages are pretty short.

Montecrypto-bar

Montecrypto, a new online game that started yesterday, appears to be a mixture between Cicada 3301, Mystery Twister C3, escape room, and the Forest Fenn treasure hunt.

Turing-Bombe-bar

The Enigma breaking machine “Bombe” had a considerable impact on the course of the Second World War. A recently started crowdfunding campaign aims to create a new Bombe display area in Bletchley Park.

Bellaso-Challenges-2-bar

The challenges of Giouan Battista Bellaso were one of the top unsolved crypto mysteries. Norbert Biermann has now published the last two parts of the solution.

M-138-bar

The M-138 is a low-tech cipher device from the first half of the 20th century. Though being quite simple, the M-138 is hard to break.

Speech-Encipherment-bar

In the Second World War, the Germans constructed a voice encryption machine. I have only very little information about this device. Can my readers help me to find out more?

Oak-Island-bar

Among the most popular stories in cryptology are those about a hidden treasure, the location of which is described in an encrypted text. Here are three more stories of this kind.

Untersberg-2-bar

According to a legend, an encrypted message was found in a cave of the Untersberg, a mountain in the Northern Alps. The cleartext is not known.