Welcome to the CrypTool Portal

The CrypTool Portal (CTP) is the starting page of the CrypTool project. Its aim is to raise awareness and interest in crypto techniques for everyone.

The CT project develops the world's most-widespread free e-learning programs in the area of cryptography and cryptanalysis. All learning programs in the CT project are open source and available for free.

E-Learning Platforms

Crypto Challenge Contest

Want to participate?

Volunteers, especially programmers, and students planning to write their thesis in the area of cryptography, are always welcome to join in the further development of the CrypTool project. You will experience project management in a distributed open-source project.

Find other crypto related websites

CrypTool participates in a chain of links through which you can discover more websites about cryptography. Click:

crypto tour gear logo crypto tour logo text
Crypto Tour Click these icons to discover other related sites

What our users say:


General News

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CrypTool 2 Release 2023.1 published

In June 2023, we released version "2023.1" which is the first release of the year. The previous CT2 versi...

Read more ... 06/16/23
More than 50 undeciphered letters of Mary Stuart were found and deciphered by George Lasry, Norbert Biermann and Satoshi Tomokiyo

For Mary Stuart researchers, it's probably the biggest cryptography discovery in recent years. Our colleagu...

Read more ... 02/07/23
CrypTool 2 Release 2022.2 released

In December 2022 we released "CrypTool 2 – 2022.1", the first release this year. The last CrypTool 2 release before...

Read more ... 12/24/22

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