When the first edition of this book was published in June 1997, its popularity caught everyone by surprise. The hacking community, however, never stands still - a thoroughly updated and revised edition of this book is required on a regular basis to discuss the hundreds of new computer system holes that are always being discovered, and to cover the latest techniques that hackers are developing to crack into computers and networks. This edition includes several completely new chapters on a variety of topics. With the resurgence in popularity of the Mac platform there will be a new chapter on Mac OS security. Additional new chapters include one on Cisco routers and switches, and one on mail security. Additionally, in many cases existing material - such as the chapters on Unix/Linux security and firewalls - will be updated and/or significantly expanded. The CD-ROM includes a comprehensive collection of security products, code examples, technical documents, system logs, utilities and other practical items for implementing Internet and computer system security.