CrypTool 1 Downloads

Release Version CrypTool 1.4.42

The current release version is CrypTool 1.4.42 (released December 21th, 2021).

CrypTool 1 is written in C++ and requires a Win32 environment. Additionally some few Java applications are enclosed (only for them to work, a Java runtime enviroment is needed).

The sources are available on GitHub.

CrypTool 1.4.42 is available in English, German, Spanish, Polish, Serbian, and French:

CrypTool on External Software Download Sites

The following sites also provide CrypTool, performing an antivirus system check before hosting and downloading. We don't check, whether they offer the newest version of CT1.


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


CrypTool 5 stars award "CrypTool was reviewed by our team and got our highest - 5 stars award."


dodownload virus-free "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."


Softonic 9/10 Award "Introduction to the wonderful world of cryptography."


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