In 2008 the magazine “The Canadian Philatelist” published an interesting article about encrypted postcards. Among other things, this article mentions a nice pigpen-enciphered postcard you can try to decipher.
Olivia von Westernhagen, who works as a journalist for the German computer magazine c’t, has provided me an article she wrote, which is based on material she found on my blog. It’s a great read, but it’s available in German only.
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?
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?
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.
In 1913, an unknown person sent an encoded postcard to a man living in the then German town of Nieder-Jeutz. It is not possible to decipher this card unambiguously, but a few guesses can be made.
An Austrian museum association has asked its Twitter followers to help deciphering an old postcard. So far, no solution has been tweeted. Can a reader of this blog solve this mystery?
In 1905 a certain Miss Rhodes from Colchester, UK, received an encrypted postcard signed with “C.Y.K.”. Can you decipher it?