CrypTool 2 (CT2) is an open-source program offering an innovative visual programming GUI to experiment with cryptographic procedures and to animate their cascades.
New CT2 Beta
The 9th Beta of CrypTool 2 was released on 20th December 2012. You are cordially invited to test and give feedback. Final version of CT 2 is planned to be published in April 2013. (2013-01-02)
First public beta of CrypTool 1.4.31
The new CrypTool 1.4.31 beta 05 is ready. You are cordially invited to test and give feedback. Final version of CT 1.4.31 is planned to be published mid 2013. (2012-07-31)
RSA sanity check
Testing RSA moduli for shared prime factors. Full article (2012-05-24)
Land der Ideen - Statements
"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.