Decrypt --- Introduction ---

Decrypt is a game of decryption. Your goal is to recover a text which is presented to you under a crypted form. The level of cryption is adjusted so that it is within the reach of humain efforts without computer help, but there are several methods and several levels...

And you can try several times, until you find the good text (or until you abandon).

Set up
Remark. This is only a game. The crypting principles used in this game are so rudimentary that they are practically never used in real life. If you want to have an idea on more advanced crypting, take a look at Graphical decrypt.