CryptTool

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. CrypTool is available in English, German, Polish, Spanish, and Serbian. CrypTool includes every state-of-the-art cryptographic function and allows you to learn about and use cryptography within the same environment.