Did you know?

That CrypTool was originally designed as an internal business application for information security training. CrypTool has since developed into an important open-source project in the field of cryptology. Over 50 volunteer developers worldwide contribute to the program.

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 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.

The CrypTool Portal is the starting page of the CrypTool project and raises awareness and interest in encryption techniques for everyone.
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.

The CT project offers different e-learning software (CT1, CT2, JCT, CTO) and additional websites (this portal and MTC3):

E-Learning Software:
  • CrypTool 1 (CT1) was the first version of CrypTool. It was released in 1998 and allows to experiment with different cryptographic algorithms. CT1 runs under Windows and has two successors: CT2 and JCT.
  • CrypTool 2 (CT2) supports visual programming and execution of cascades of cryptographic procedures. CT2 contains an especially large number of cryptanalysis methods and also runs under Windows.
  • JCrypTool (JCT) is platform-independent and runs under Linux, Mac and Windows. One focus are post-quantum (signature) algorithms.
  • CrypTool-Online (CTO) was released in spring 2009. Here you can try out in a browser (on a PC or a smartphone) different algorithms.
Additional website:
  • MTC3 is an active international crypto cipher challenge offering cryptographic riddles of 4 different levels. You can discuss solutions in the moderated forum.

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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