This offbeat, non-technical book examines what hackers do, how they do it, and how readers can protect themselves. The completely revised fourth edition of this bestseller (over 150,000 copies sold) adopts the same informative, irreverent, and entertaining style that made the first three editions a huge success. New chapters discuss the hacker mentality, lock picking, exploiting P2P file sharing networks, and how people manipulate search engines and pop-up ads. Includes a CD with hundreds of megabytes of hacking and security-related programs that tie-in to each chapter in the book.