Server maintenance on January 28, 2020

The CrypTool website will be offline due to maintenance work on Tuesday January 28, 2020 from 6:00 AM UTC to 10:00 AM UTC.

Did you know?

...that CrypTool is open source? 

The following sites also provide CrypTool, performing an antivirus system check before hosting and downloading.


"Who ever wanted to know for example how a digital signature is computed, finds a patient mentor in the e-learning platform CrypTool."

"CrypTool was reviewed by our team and got our highest - 5 stars award."
dodownload virusfree
"Your product CrypTool 1.4.21 has been REALLY tested on Tuesday 05th of January 2010 by the newest antivirus system of the and found to be *Safe and Clean*. It does not contain any kind of Trojans, Adware, Spyware and Viruses."
"Your software "CrypTool" has been chosen by our visitors and was selected as an editorial pick. We are impressed by the quality and cleanliness of the program."

"Introduction to the wonderful world of cryptography."

downloadatlas editors choice

"CrypTool 1.4.21 got an Editor's pick award from Download Atlas."

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