CrypTool

CrypTool is a freeware program which enables you to apply and analyze cryptographic mechanisms. It has the typical look-and-feel of a modern windows application.

CrypTool contains exhaustive online help, which can be understood without extensive knowledge of cryptography, therefore no printed user manual on how to use CrypTool is provided. The complete version of CrypTool is available in English and German. CrypTool has implemented almost all state-of-the-art crypto functions and allows you to learn about and use, cryptography within the same environment.

The methods available include both classic methods and modern cryptosystems: classic methods: e.g. the Caesar cipher and the double-column transposition (permutation) encryption algorithm. modern methods: e.g. the RSA and AES algorithms, hybrid encryption and algorithms based on elliptic curves.