Since we're talking more and more about encryption, decryption code, adopted in violation of the protections on DVDs and more, here are some hints to help you understand, at least in broad terms, an argument is extremely varied, interesting and complex.
The art of critografia, ie the ability to hide a message to everyone except for a specific recipient, dates back to ancient times. In general encrypt a message is to choose an encoding method, and there are several. The drawback, until recently, was that this method should not only be known by the sender (who criptava the message), but - of course - even by the recipient. In other words, sender and recipient must find a way to exchange the encryption method.
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