Here’s a postcard that was sent from the Isle of Wight to London in 1905. Can a reader decipher it?


In 1901 an unknown person sent an encrypted postcard from Iserlohn, Germany, to nearby Arnsberg. Can a reader decipher it?


A postcard from 1903 is encrypted in a dancing men code, like it is described in a famous Sherlock Holmes story. Can a reader decipher it?


Here’s a postcard written in English that contains two kinds of encryption. Can a reader decipher this two-part cryptogram?


Here’s another crypto postcard. As the encrypted part of the message has only 17 letters, it is probably hard to decipher.


In 1909, an unmarried woman in Newcastle, Australia, received an encrypted postcard. Can a reader decipher it?


Only three of the many encrypted postcards I have covered on this blog so far have remained unsolved. The one I am going to introduce today might be number four.


Two postcards from the early 20th century are written in Morse code or something similar. One of these cryptograms is still unsolved.


In 1905, an encrypted postcard was sent from San Francisco to Paris. Can a reader break it?


Today’s crypto mystery is about a postcard written to a noblewoman in 1914. Can a reader solve it?