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)
"Thanks a lot for the release of CrypTool, which is an excellent tool for teaching cryptography. As for the feedback from the students, I would like to mention that I haven't had any complaints about CT. Generally, students are very positive about the tool and we are certainly continue to use it in our lab."