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 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.

University of Siegen, Germany

The University of Siegen contributed an extensive number of features to the CrypTool project, e.g. they have been supervising several CrypTool related final exams. The CrypTool project was presented at a big public event at the University of Siegen as a result of its award as Selected Landmark in the Land of Ideas, the biggest German nationwide event series in 2008.



University of Duisburg-Essen, Germany

The University of Duisburg-Essen has been in the CrypTool project since 2007 and entered into several commitments. Moreover, the core architecture team of CrypTool 2.0 was based there.
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Ruhr-Universität Bochum, Germany

The Ruhr-Universität Bochum provides the CrypTool project with special knowledge about several cryptology-related topics. Their main purpose is to take care of quality management work, i.e. review of the online help and evaluation of user interfaces. Moreover, they supervise students who integrate functionality in CrypTool 2.0 and they administer the MTC3 website.


Universität Kassel

Technical Lead of the CrypTool 2 project is Prof. Dr. Arno Wacker, lead of the department "Softwaretechnik für Ubiquitous Computing Anwendungen". They conduct the hosting of the official CrypTool website as well as the Cryptoportal, the CrypTool 2.0 developer page and all related CT2 material. Moreover, the core architecture team of CrypTool 2.0 is based in Kassel.


Deutsche Bank AG

CrypTool has been initially developed for the purpose of security awareness trainings within Deutsche Bank. After the initial requirements were met, Deutsche Bank decided to hand over CrypTool to the opensource community. From the very beginning, Prof. Bernhard Esslinger was the main coordinator of the CrypTool project.


Technische Universität Darmstadt, Germany

The Technische Universität Darmstadt hosted the former CrypTool website. Additionally, they have been providing the CrypTool 1.x source code repository from the very beginning. Now they are mainly involved in the new JCrypTool project and assist in number theoretical issues.

Center of Advanced Security Research Darmstadt (CASED)

Prof. Johannes Buchmann's research group "Cryptography and Computeralgebra" at TU Darmstadt develops the FlexiProvider library, an open-source Java library for usage of cryptographic primitives and protocols in Java programs. Further developments of the provider are accomplished in the context of the CASED research center. FlexiProvider is used in JCrypTool.


Politechnika Warszawska, Poland

The Warsaw University of Technoloy translated both the CrypTool e-learning software and the website into Polish.
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Consejo Superior de Investigaciones Científicas, Spain

The 'Spanish National Research Council' in Madrid translated both the CrypTool 1 e-learning software and the old website into Spanish.

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Klagenfurt University, Austria

The research group for system security contributes to the quality assurance, as part of the beta testing team. They also provide ideas and feedback with respect to the further development of CrypTool in the academic area.



FH Oberösterreich, Campus Hagenberg

The Department "Secure Information Systems" at the University of Applied Sciences Upper Austria, Campus Hagenberg has been contributing to the JCrypTool project since 2007 by implementing many procedures, protocols, and visualizations.


University of Singidunum, Serbia

The Department for Informatics and Computing at Singidunum University in Serbia has contributed plugins for network based communication between remote CrypTool 2 environments. These plugins are the result of many years of successful usage of CrypTool for teaching cryptology.

The above list is not complete as many people and organizations contribute to the CrypTool project without extra credits on this website.
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