What is CrypTool 1?

CrypTool 1 (CT1) is an open-source Windows program for cryptography and cryptanalysis. It’s the most widespread 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 workflow.

What is JCrypTool?

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

What is CrypTool-Online?

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.

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.
Could you spare a few minutes? Please participate in this short UX survey about CT2 and CrypTool-Online. Your feedback will help us to improve the usability of our software for you.

The CrypTool Portal

The CrypTool Portal is the starting page of the CrypTool project and raises awareness and interest in encryption techniques for everyone. The CT project offers different e-learning software (CT1, CT2, JCT, CTO) and additional websites (this portal and MTC3).

All learning programs in the CT project are open source and available for free. The CT project develops the world's most-widespread free e-learning programs in the area of cryptography and cryptoanalysis.

CrypTool in your browser

CrypTool to be downloaded

Crypto Challenge Contest


Participate!

Volunteers, especially programmers, and students planning to write their thesis in the area of cryptography, are always welcome to join in the further development of the CrypTool project. You will experience project management in a distributed, agile project.


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