Yesterday I visited the exhibition “Top Secret!” in Mons, Belgium, together with a few friends and blog readers. Apart from many fascinating exhibits, three interesting photographs of rare cipher machines caught my attention. Can my readers say something about the background of these devices?


The NSA Symposium on Cryptologic History 2017 featured a number of very interesting presentations. Here are videos of a few of them. In addition, I will introduce three crypto puzzles I encountered at the symposium.


I hereby invite all my readers from Germany, France, UK and the Benelux region to join me at the “Top Secret!” exhibition in Mons, Belgium, next Saturday.


Yesterday and today about 25 European cipher history experts have met at Smolenice Castle in Slovakia. It was a great event.