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CrypTool
CrypTool provides online cryptology tools and links to documentation, education, and books.
About CrypTool
CrypTool provides software and supporting materials for learning, teaching and exploring cryptography. CrypTool-Online runs in the browser and covers ciphers, codings, cryptanalysis and games, while CrypTool 2 for Windows lets users visually connect cryptologic components into workflows. The site also links to MysteryTwister puzzles, a tool for transcribing and cryptanalyzing historical manuscripts, JCrypTool and CrypTool 1, a book, and school materials.
Some resources have limits: CrypTool 2 and CrypTool 1 require a Windows download, other desktop tools require downloads for Windows, Linux or macOS, and MysteryTwister and the grade-11 course run on external websites. The grade-11 course is only in German and was created for Bavarian schools, and school project days require in-person attendance. Further development of CrypTool 1 and JCrypTool has been discontinued, though JCrypTool is still maintained.
Key features
- Browser tools for ciphers, codings, cryptanalysis and games
- Visually connect cryptologic components into custom workflows
- Online puzzle contest with four levels including beginner and mystery
- Transcribe and cryptanalyze historical encrypted manuscripts
- Step-by-step cipher lessons with tasks for Bavarian grade 11
- Learning plugins including post-quantum signature algorithms
Best for: Students, teachers, historians and linguists interested in learning or teaching cryptography.
Good for
- Free software and supporting materials for learning and teaching
- CrypTool-Online works in the browser and on mobile devices
- Free chapters of the CrypTool book are available
Watch out for
- CrypTool 2 requires a Windows download
- 11th-grade learning course is only in German
- Further development of CrypTool 1 has been discontinued
CrypTool at a glance
- Website
- cryptool.org
- Category
- Education & Learning › Learn to Code
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Web, Windows
- Open source
- Not stated
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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CrypTool FAQ
Is the 11th-grade learning course available in English?
No, it is only in German and was created for the 11th grade of Bavarian schools.
Is CrypTool 1 still being developed?
No, further development was discontinued in favor of CrypTool 2.
Is the CrypTool book free?
No, it is a paid book with free chapters available.
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