"CrypTool has been produced in an extremely professional and innovative way. It is helpful as an educational tool for the novice and provides excellent practical experience for the knowledgeable."
Prof. Fred Piper, Royal Holloway University
New Version of CrypTool — CT 1.4.41 released
A new release of CrypTool 1 was published on March 27, 2018.
This mature version is available in 6 languages (German, English, Spanish, Polish, Serbian, and French). Compared to 1.4.40, it contains many small bug fixes and corrections (especially for functions using Animal, Flash, HTML, and PDF).
The website CryptoPrograms http://www.cryptoprograms.com is dedicated to create and solve classical ciphers online. New on this site are analyzers for solving classical ciphers without any knowledge of the keyword and, in many cases, the key length. Routines for solving around 40 cipher types are provided.
RSA sanity check
Testing RSA moduli for shared prime factors. Full article (2012-05-24)