JCrypTool (JCT) is an open-source e-learning platform, allowing to experiment comprehensively with cryptography on Linux, MAC OS X, and Windows.
The CODEBREAKERS.EU cryptology game -- 4th edition
On June 1st, 2015 begins a "fantastic game" starting with the 1st of six tasks on the Enigma level. The material to be studied is published twice a week, but the time in which you work out the final tasks matters the most. (2015-06-01)
The release version of CrypTool 2.0 was released on 20th Aug 2014. We would be happy if many of you use it for teaching, self-study, education and awareness and give us feedback. (2014-08-25)
Article about solving the Double-Transposition Challenge in Cryptologia
A level X challenge in MysteryTwister C3 by Klaus Schmeh using the double-column transposition cipher withstood a long time against cryptanalysis efforts. Nevertheless, it was solved in November 2013 by George Lasry. (2014-06-25)
"In the field of educating students or IT-professionals, this tool gives you much support and wonderful help to increase their knowledge. Beside of theoretical background, it gives the possibility to consolidate the knowledge by practical experiences. Only this mixture of theory and practice leads to real understanding."