In 1909, a woman living in Toledo, Ohio, received an encrypted postcard. Can a reader decipher it?
In the early 19th century, an unknown person sent an encrypted postcard from Munich to Berlin. It is not hard to decipher.
In 1905 and 1906 a man named Harry sent a series of encrypted postcards to a friend named Charlie. Can a reader decipher these messages?
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.