The CrypTool website will be offline due to maintenance work on Tuesday January 28, 2020 from 6:00 AM UTC to 10:00 AM UTC.
You can directly visit one of the CrypTool topic pages by clicking one of the five buttons here below.
CrypTool 1 (CT1) is an open-source Windows program for cryptography and cryptanalysis. It’s the most wide-spreaded e-learning software of its kind.
CrypTool 2 (CT2) is an open-source program offering an innovative visual programming GUI to experiment with cryptographic procedures and to animate their cascades.
JCrypTool (JCT) is an open-source e-learning platform, allowing to experiment comprehensively with cryptography on Linux, MAC OS X, and Windows.
CrypTool-Online (CTO) runs in a browser and provides a variety of encryption and cryptanalysis methods including illustrated examples and tools like password generator and password meter.
MysteryTwister C3 (MTC3) is an international Crypto Cipher Contest offering a broad variety of challenges, a moderated forum, and an ongoing hall-of-fame.
It has always been essential for every version of CrypTool to come with thorough documentation about its features. Whenever the user presses F1 on their keyboard, corresponding information about the feature currently selected appears.