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CrypTool 1

CrypTool 2

JCrypTool

CrypTool Online

Mystery Twister C3

CrypTool 1

What is CrypTool 1?

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

What is CrypTool 2?

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

What is JCrypTool?

JCrypTool (JCT) is an open-source e-learning platform, allowing to experiment comprehensively with cryptography on Linux, MAC OS X, and Windows.

CrypTool-Online

What is CrypTool-Online?

CrypTool-Online (CTO) runs in a browser and provides a huge variety of encryption methods and analysis tools including many illustrated examples.

Mystery Twister C3

What is MysteryTwister C3?

MysteryTwister C3 (MTC3) is an international Crypto Cipher Contest offering a broad variety of challenges, a moderated forum and an ongoing hall-of-fame.

CrypTool 1

CrypTool 2

JCrypTool

CrypTool-Online

Mystery Twister C3

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CrypTool-Online

What is CrypTool-Online?

CrypTool-Online (CTO) runs in a browser and provides a huge variety of encryption methods and analysis tools including many illustrated examples.

CrypTool News

CT 2.0 released

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)

New CT2 Beta

The 10th Beta of CrypTool 2 was released on 19th October 2013. You are cordially invited to test and give feedback. Final version of CT 2 is planned to be published in July 2014.

(2013-11-26)

Land der Ideen - Statements

"Thanks for giving us CrypTool."

Nikhil Bhalla, Pune, Maharashtra, India