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?
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?
I have an appearance in a YouTube video that introduces the ten most notable unsolved cryptograms. More than a million people have already watched it.
Canadian artist Zen Rankin has published two encrypted messages he created in his youth days. Can a reader break them?
An alleged cryptanalyst has published a new hypothesis about the Somerton Man cryptogram on Wikipedia. Does it make sense?
A video by US musician Laurie Anderson contains a spoken sequence of numbers. Can a reader make sense of it?
At first sight, an encrypted postcard from 1909 looks like many others I have introduced on this blog. However, the encryption method used is unusual.
An encrypted telegram from Italy is unsolved. Can a reader find the codebook that was used? Without the codebook, deciphering the telegram is as good as impossible.
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