CrypTool 1 Downloads
Since mid 2026, CrypTool 1 is deprecated and no longer supported — no bugfix or maintenance versions will be released. The downloads below are the last release, version 1.4.42 (December 21, 2021). If you rely on CT1, see the three options on the CT1 page — including a makeshift workaround for the failure in the CA certification step.
Release Version CrypTool 1.4.42
The last release version is CrypTool 1.4.42 (released December 21, 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:
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CrypTool 1.4.42 — English version
SHA256: 3853a69a3477bf7e33c001937ecae092ad2ebfdf698395aa726d11e37a9468e4 -
CrypTool 1.4.42 — German version
SHA256: 6d89b4b53af644fba30d936942e7d99fda451b7c653d4990ac83d722d7d06ef4 -
CrypTool 1.4.42 — Spanish version
SHA256: 62f0681356e9b3a9cb32a13eccd8a61d9deb0a108ce17c8914668e7460601eab -
CrypTool 1.4.42 — Polish version
SHA256: c69b6ff11ddebc5b9ee63409570f614adefbf54f2280e9a3896cf362ea6700a1 -
CrypTool 1.4.42 — Serbian version
SHA256: 3e0c79bc86713e98d665bc08372310813a9bd2b3d58ef8695486d3ce49029900 -
CrypTool 1.4.42 — French version
SHA256: fa423a60ad3a63013aadd8290784b91459433da6482f8f0117ecd4fa521ca9b6
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.
“Who ever wanted to know for example how a digital signature is computed, finds a patient mentor in the e-learning platform CrypTool.”
heise.de
“CrypTool was reviewed by our team and got our highest - 5 stars award.”
dodownload.com
“Your product CrypTool 1.4.21 has been REALLY tested on Tuesday 05th of January 2010 by the newest antivirus system of the Dodownload.com and found to be Safe and Clean. It does not contain any kind of Trojans, Adware, Spyware and Viruses.”
dodownload.com
“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.”
downloadroute.com
“Introduction to the wonderful world of cryptography.”
softonic.com
“CrypTool 1.4.21 got an Editor's pick award from Download Atlas.”
downloadatlas.com