In 2013 the German intelligence service BND published four challenge ciphers. To my knowlege, the solutions have never been published.
In 1935 US president Franklin D. Roosevelt received an encrypted letter from an anonymous person. The solution of the main part is not known.
Alexander Hamilton, one of the Founding Fathers of the United States, has become especially popular since a musical was written about him. Hamilton left behind a 26×26 turning grille.
In the novel Mathias Sandorf by Jules Verne the use of a Turning Grille is described. Does a reader know other encrypted messages of this kind?
In 1873 George Furlong, official at the soccer club Luton Town FC, sent an encrypted letter to his sister. Can a reader break this encryption?
A postcard from 1906 is written in a combination of Morse code, numbers, and letters. Can a reader solve this unusal cryptogram?
Two years ago I blogged about an encrypted certificate, which was found in the wall of a house. Nobody could solve this cryptogram. So, it’s time to have a second look at it.
A blog reader has sent me pictures of a cigaret case from 1909, which bears an encrypted inscription. Can a reader decipher this cryptogram?
In a little known book I found a story about encrypted notes from 1905, including a diary. Can my readers support me with finding out more about these documents and decrypting two paragraphs?
The Polish city of Poznań offers a number of interesting Enigma sights. Now, a new one is planned: an Enigma information center. Suggestions from my readers on how this place might look like are highly welcome.
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