Mudge, Division Scientist at BBN Technologies, former advisor to the White House and Congress, author of L0phtCrack, and founder of @stake, and Intrusic
“Like useful scriptures this book has stood the test of time. Still relevant, still poignant, still indispensable – the Fifth Edition is a modern day bible for networking and systems security professionals.”

Marty Roesch, creator of the Snort tool
"If there was an Encyclopedia Brittanica of computer security, it would be Hacking Exposed."

Thomas Ptacek, Researcher at Arbor Networks
“Real security is proven by trying to break it, and few sources will show you how to do that better than Hacking Exposed Fifth Edition”

AlephOne, Bugtraq Moderator
"If this book doesn't scare and motivate you to take security seriously, nothing will."

Simple Nomad, author of The Hack FAQ and Pandora
"The best just got better. More info, more up to date, and more timely than ever. The best full-disclosure security book you can buy."

Lance Spitzner, President and Founder of the Honeynet Project
"A critical step to knowing your enemy is first understanding their tools. Hacking Exposed Fifth Edition delivers just that...and more."

Pete Murphy, Senior Vice President for Vulnerability and Response Management at Bank of America
(from the Foreword to the Third Edition)
"I hold great respect for the authors of this book. I have sought and received excellent advice from them over the years. In Hacking Exposed, they really have written 'The Book' on vulnerabilities and countermeasures. Read it, heed it, and use it."

Barnaby Jack, Win32 Buffer Overflow expert
"The network security book that set the standard takes another leap forward. Hacking Exposed, Third Edition provides the reader with a complete and concise guide to the tools and techniques employed by todays attackers. Whether you're a struggling novice or a seasoned pro, whether you're on the offensive or the defensive - Hacking Exposed 3rd Edition is required reading."

Ofir Arkin, ICMP researcher
"This book will give you what no other source will: the ability to definitively confirm the security of your network, using hands-on experience."

David Dittrich, DDOS expert and Univ. Washington consultant
"Threats to system and network owners are increasing in sophistication and number. Whether it is network mapping, exploitation of an increasing number of holes, use of root kits for post compromise concealment, or distributed denial of service, knowing how you are attacked and how to defend is critical. Hacking Exposed 3rd edition manages to bring order to all aspects of attack tools and methods, and provides countermeasures and links to current research papers to help you improve your defenses."

Bruce Schneier, internationally renowned security author and technologist
(from the Foreword to the Second Edition)
"*Hacking Exposed* is a comprehensive bible of security vulnerabilities: what they are, how they work, and what to do about them. After reading this you will know more about your network and how to secure it than any other book I can think of. This book is informational gold."

Rain Forest Puppy (RFP), Web server security authority and discoverer of the IIS MSADC vulnerability
"Whether your an administrator looking to protect your network, a programmer looking to avoid historical security mistakes, or a curious individual wondering how network security works, Hacking Exposed provides a solid basis of common attack procedures and defenses that everyone in the security industry should know by heart."
Simple Nomad, noted NT/NetWare/Internet security expert, author of The Hack FAQ and Pandora

"The problem with most useful security books is that they are out of date with a year. But not Hacking Exposed. The best just got better. More info, more up to date, and more timely than ever. The best full disclosure security book you can buy."

Fyodor, author of the incomparable nmap security scanner
"Hacking Exposed 2nd Edition takes full disclosure to the next level. The authors provide detailed explanations of the latest network penetration techniques along with the steps neccessary to defend against them. Due to heavy updates and coverage of the latest tools and exploits, I recommend HE2K even to readers of the instant-classic '99 edition."

Georgi Gunninski, widely published Internet security researcher
Marcus Ranum, CEO of Network Flight Recorder
(from the Foreword to the First Edition)
"My experience in securing systems is that most users are shocked when they find out how vulnerable they really are. Perhaps this book will shock you. No matter what, it will educate you."

Mike D. Schiffman ("Route"), Editor of Phrack, security researcher and author of the Firewalk tool
"The authors have put together an excellent up-to-date resource on modern security vulnerabilities. Rather than simply documenting a few case studies and talking about problems on a macro scale, the authors build up a robust framework and dissect the security issues completely. Each vulnerability covered has detailed countermeasure information. More than a how-to manual, it's a how-to-do-it-right manual. A book like this has been needed for quite some time now."

Simple Nomad, Renowned Security Researcher and Author of The Hack FAQ
"This book is destined to be a classic. Unlike most other security books, this explains details on hacker tools - why they are used, how they work, and how best to protect yourself from them. The underground already knows this stuff, and this book helps the sys admin see their systems through the intruder's eyes."