Heute gibt es gleich sechs verschlüsselte Postkarten und zusätzlich noch einen rätselhaften Tweet der britischen Zentralbank.

Blog-Leser Jan Pulkrábek hat mir ein schönes Weihnachtsgeschenk zukommen lassen, das ich zum Jahresauftakt mit meinen Lesern teilen will: 16 verschlüsselte Postkarten aus den Jahren 1898 bis 1900 mit Lösung und Übersetzung.

Blog reader Mark Baldwin has provided me two encrypted postcards written in the early 20th century to recipients in England. One of these is easy to decipher, the other one appears to be more tricky.

Postcard enthusiast Günther Hunger from Oschatz has provided me a scan of an encrypted message from the early 20th century. Can a reader decipher it?

In 1908, an ecrypted postcard signed with “Somebody” was sent to a sobriety organisation in Northern Ireland. Can a reader decipher it?

In 1907, a young woman from Orimattila, Finland received an encrypted postcard. Can a reader decipher it?

Here are two cryptograms that are easy to solve: a postcard sent from Dortmund, Germany, in September 1900 and another one sent from the same place a few weeks later.

It’s probably not a Christmas card, but at least an encrypted card that was sent on the occasion of a celebration. Can a reader decipher this cryptogram?

Here’s one of the oldest encrypted postcards I have ever seen. Can a reader decipher it?

My users ure usually very successful when it comes to breaking encrypted postcards. Anyway, the one I’m going to introduce today might be a tough challenge.