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.

Man in charge:
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University of Siegen
Institute of Information Systems (FB5)
57068 Siegen
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Bundeswehr University Munich
Department Computer Science (INF5)
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CrypTool is a non-commercial open source project. The CrypTool project is a non-profit project and is based mostly on voluntary work. The CrypTool project aims to aware in all publications the copyright and performance protection rights of content used, to use its own content, especially to use graphics, sound documents, video sequences and texts or to use license-free content, especially graphics, sound documents, video sequences and texts. All trademarks used on this website possibly protected by third parties or copyrighted works are subject without any limits to the provision of the applicable copyright and intellectual property law or trademark law and the ownership rights of the registered owners. The mere use is not the conclusion that trademarks or contents are not protected by third party rights. The copyright and intellectual property rights for published and internally generated content remains with CrypTool and the relevant picture agencies / photographers mentioned. Any reproduction, modification, distribution, translation, storage, processing or reproduction or other use of such content, especially graphics, audio, video, text and photographs is not permitted.
Copyright of photographs
  • Credit: p3670059 Photographer Tim Kubach, plainpicture
  • Credit: p3287581f Photographer Kristopher Grunert, plainpicture
Referring to §7 par. 1 of the German Tele-Media Act (TMG), as a service provider we are responsible as a service provider for our own content on this website. Beside the information we provide firsthand, this website contains links to third party websites. Before setting the links, we evaluated the content of these websites. However, as to §7 par. 2 of the TMG, we are not obligated to continous monitoring of that content. As soon as we find out that one of the websites we link to contains unlawful data, we will remove the associated link. Under no circumstances are the involved universities (e.g. Duisburg-Essen, Kassel, and Siegen) responsible for the content of both this website and the links to other websites.
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