Data Encryption is the intentional scrambling of information into unreadable form – until it is later converted back into its original form by the intended recipient.

Looking for data encryption tools or info have a look below:

GNU Privacy Guard – GNU Privacy Guard (GnuPG) is an open-source implementation of the famed Pretty Good Privacy (PGP) encryption

TrueCrypt – TrueCrypt is a free, powerful, and on-the-fly disk encryption tool. This happens to be my very favorite tool.

Pidgin-Encryption – Pidgin-Encryption transparently encrypts your instant messages with RSA encryption. Its simple and very secure.