Encryption
Encryption is the process of transforming information to and from an unreadable format. Some algorithms simply scramble text; others allow for reversing the process. PHP offers a wrapper to C's crypt function, plus an extension that wraps the mcrypt library.
The mcrypt functions rely on a library of the same name written by Nikos Mavroyanopoulos, which provides an advanced system for encrypting data. The URI for the project is <ftp: //argeas.cs-net.gr/pub/unix/mcrypt/>. Sascha Schumann added mycrypt functionality to PHP.
Cryptography is a topic beyond the scope of this text. Some concepts discussed in this section require familiarity with advanced cryptographic theories. A great place to start learning about cryptography is the FAQ ...
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