KUMEL'S NOTE

Suhosin is an advanced protection system for PHP installations. It was designed to protect servers and users from known and unknown flaws in PHP applications and the PHP core. Suhosin comes in two independent parts, that can be used separately or in combination. The first part is a small patch against the PHP core, that implements a few low-level protections against bufferoverflows or format string vulnerabilities and the second part is a powerful PHP extension that implements all the other protections.

Tor is an application that allows you anonymise your IP address. I.e you can visit www.google.com on 26th Jun 2011 and Google will not record your actual IP address, but the one presented by Tor, this means that a review of logs stored by Google will not, in theory, show a record of you visiting the site on that date.
What is privoxy?
Privoxy is a non-caching web proxy with advanced filtering capabilities for enhancing privacy, modifying web page data and HTTP headers, controlling access, and removing ads and other obnoxious Internet junk. Privoxy has a flexible configuration and can be customized to suit individual needs and tastes. It has application for both stand-alone systems and multi-user networks.
How to use the internet anonymously using Tor in linux Backtrack 5?
at first step we must add repo in /etc/apt/sources.list
deb http://deb.torproject.org/torproject.org lucid main

Pretty Good Privacy (PGP)?
What is it?
It is a data encryption and decryption computer program that provides cryptographic privacy and authentication for data communication. PGP is often used for signing, encrypting and decrypting texts, E-mails, files, directories and whole disk partitions to increase the security of e-mail communications. It was created by Phil Zimmermann in 1991.
GNU make a product which useful for PGP and its name is GPG (GNU Private Guard).