CrypTool Portal

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You can directly visit one of the CrypTool topic pages by clicking one of the five buttons here below.

CrypTool 1

CrypTool 2

JCrypTool

CrypTool Online

Mystery Twister C3

CrypTool 1

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.

CrypTool 2

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.

JCrypTool

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.

CrypTool-Online

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.

Mystery Twister C3

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.

CrypTool 1

CrypTool 2

JCrypTool

CrypTool-Online

Mystery Twister C3

Free downloads

New Update Site

Launch JCrypTool and open the preferences via Window - Preferences
Expand the Install/ Update section and select Available Software Sites
There should be one entry with the location http://www.cryptool.org/jcryptool/update
Select this entry and click Edit
Replace the location link with the new update site URL http://www.cryptool.org/jct/update
You can give the update site a name optionally (in case this wasn't filled automatically)
Click OK to close the dialog and OK to close the preferences

That's it. Now you can use the update manager again.

In case you are already using release candidate 5a (RC5a) you do not have to update the URL.

JCrypTool News

Release Candidate 7 available

JCrypTool 1.0.0 Release Candidate 7 is available for download! This release contains a lot of bugfixes, feature enhancements and six new crypto plug-ins.
Read more...

New Update Site

The JCrypTool update site moved to http://www.cryptool.org/jct/update. This URL must be updated in JCrypTool manually if you are using a release older than release candidate 5a. Read more...

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