This book is about one of the most crucial aspects of system and security management: host integrity protection. Fundamentally, host integrity protection is all about understanding the changes that occur on your system friendly or hostile, deliberate or accidental and understanding the impact of those changes. In other words, it's change control in a potentially hostile environment. Best of all, this book is written by Brian Wotring, who has designed and deployed host integrity monitoring systems, used them, and relied on their results. It's hard to overstate the value of such experience. Book.