In 2016 several Brazilian newspapers reported on two encrypted letters sent by imprisoned members of the criminal organization PCC. Can my readers help to decipher the letter excerpts that are publicly available?
In 1911, the British consul in Lüderitz, German South West Africa, sent an encrypted telegram to the foreign ministry in London. Can a reader break this encryption?
Here’s an encrypted postcard from the town of Mannswörth, Austria. Can you decipher it?
A postcard depicting tourist attractions in the Swabian Jura bears an encrypted message. Can you decipher it?
On a US website, a cryptogram from the Civil War is introduced. The plaintext is written below it. Can a reader find out if the decryption is correct and what cipher has been used?
Three shorthand postcards, written in Swedish, Volapük and German, wait to be solved. Can you decipher any of these?
In 1922, a man from Luxemburg sent a postcard to a recipient living in the famous brandy town of Cognac, France. The message on the postcard consists of only seven letters. Can a reader find out what it means?
The eighth Alan Turing Cryptography Competition for school children has been announced by the University of Manchester. The competition will start in January 2019. The challenges of the past issues are available online.
Harry Welsch was a notable German cryptographer and mathematician during the Second World War. Not much seems to be known about him. Norwegian Enigma expert Frode Weierud would like to change this. Can my readers help?
A cryptogram that was found on the wall of a tunnel at the University of Texas has been discussed on several websites for years. Can a reader of this blog finally find the solution?
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