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JCrypTool builds are based on Eclipse RCP and require Java 8 or newer as runtime environment.

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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 variety of encryption and cryptanalysis methods including illustrated examples and tools like password generator and password meter.

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.

JCrypTool installation instructions are available here.

The most important resource for users and developers is the integrated online help in JCrypTool. Simply click on the question mark icon in the main menu bar to open the JCrypTool help system. Or use the context sensitive help to display short instructions for the selected part.

The most important resource for developers is, besides the online help in JCrypTool, our wiki. Any JCrypTool team member is authorized to update our wiki with new information important for other developers.

Besides these two resources, some PDF documentation is available for download.

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