About CTG

There are hundreds of places in the world that are worth seeing for people interested in cryptology. This website is a guide to these cryptographic places.

Goto map now.

Check here for details.

Contact CTG

Klaus Schmeh, Nikolaus-Gross-Str. 32, 45886 Gelsenkirchen, Germany
Email: [my first name]@schmeh.org
Tel.: +49-209-1659839