An excellent guide that thoroughly explains internet security via various types of firewall implementations. This book is intended for readers with a moderate amount of Unix knowledge.

The most in-depth crypto book you could ever read, it explains the workings of practically every kind of cryptosystem in detail. The book does get somewhat maths-intensive, but is accessible to readers of any level.

A fantastic book detailing one of the most exciting hacker investigations ever. Stoll is an astronomer that becomes obsessed with tracking down a hacker named "Hunter" who has invaded one of his university computers. A must-read.

A classic examination of the hacker subculture, Sterling begins by exploring the beginning of hacking and then goes on to highlight the assault on hackers in the 80s and 90s. He also explores both the legal and ethical issues involved.