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.

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 Dodownload.com 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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