Person responsible

  • Prof. Bernhard Esslinger, University of Siegen, Institute of Information Systems (FB5), Kohlbettstr. 15, 57068 Siegen, Germany




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.


Sources and copyright of images

For all images used, care has been taken to ensure that they are royalty-free or publicly licensed, if possible. If you still do not see your license respected or would like to be linked, please feel free to write us a message. We will then remove the image or link you if you wish.



Referring to §7 par. 1 of the German Tele-Media Act (TMG), 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.