Homepage - CrypTool

Welcome to CrypTool

Here you can try crypto tools, learn cryptography and solve puzzles. Our goal is to create interest in crypto techniques and provide easy access.

Play around with different cryptographic algorithms directly in your browser. For PC and mobile. No download needed.

Visual programming, cascards of cryptographic procedures, and lots of cryptanalysis methods. Download for Windows.

International crypto cipher challenge, offering cryptographic riddles of 4 levels. External website.

Java-based tool for transcription and cryptanalysis. Especially for encrypted historical documents.

Experiment with different cryptographic algorithms on Windows (started in 1998, unmaintained now). Download needed.

Runs on Linux, macOS and Windows. One focus are post-quantum signature procedures.

Learn/teach cryptography at your school. We sometimes organize practical project-days with your teachers. Feel free to contact us.

The CrypTool project started in 1998 as a training project for IT employees of Deutsche Bank AG and developed the e-learning software CrypTool 1.

Over the years, CrypTool 2 and Java CrypTool were added, the crypto puzzle contest MysteryTwister and the web application CrypTool-Online. Also the CrypTool Book.

Through the support of universities and research projects we can offer you everything here free of charge.

If you want to participate yourself, feel free to write us a message.

The CrypTool project is hosted, funded and supported by the Research Institute CODE. Thank you very much.