Release Candidate 7 available

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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.

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.

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.

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.

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.

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Land der Ideen - Statements

"CrypTool already provides a strong basis for educational activities and there is great merit in continuing this development. There is scope for adding new algorithms, [...], and new cryptanalytic methods as they emerge. In summary I feel that CrypTool can play a very fruitful role in education about cryptography, and thus have a positive impact on this field in general."

Prof. Dr. Dieter Gollmann, TU Hamburg-Harburg

CrypTool News

CryptoPrograms with Online Analyzers

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.

(2017-07-30)

Release Candidate 8 available

JCrypTool 1.0.0 Release Candidate 8 is available on our download page.

Join the #CSCG

The Cyber Security Challenge Germany (CSCG) is the German hacking competition for pupils and students. There are 12 online challenges starting on May 2nd, 2016. The juveniles have to solve different IT-Security tasks till August.