JCrypTool (JCT) is an open-source e-learning platform, allowing to experiment comprehensively with cryptography on Linux, MAC OS X, and Windows.
CT 2.0 released
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)
The 10th Beta of CrypTool 2 was released on 19th October 2013. You are cordially invited to test and give feedback. Final version of CT 2 is planned to be published in July 2014.
Land der Ideen - Statements
"This tool teaches in a very easy and touchy way, how to implement confidentiality, integrity and evidence (electronic signatures). Especially the understanding of electronic signatures will be of a very high importance for the time to come. Customers must understand this technology, otherwise there will be no trust or confidence in e-Government or e-Commerce, and the huge investments in these areas will generate no return."