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)
"I have been using CrypTool to support laboratory teaching of our cryptography class at Royal Holloway, University of London for several years now and it just keeps getting better and better." (September 2012)
Professor Keith M. Martin, Director of the Information Security Group (ISG) at Royal Holloway, University of London.
New CT2 Beta
The 9th Beta of CrypTool 2 was released on 20th December 2012. You are cordially invited to test and give feedback. (2013-01-02)