Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Scary

This book goes beyond the movie The Net (which was technically flawed) and presents a frightening glimpse of what a determined hacker could do if he was also a psycho killer. The hacker has created a virtually undetectable trap door program that can invade a victim's computer undetected and provide the hacker with a with all key strokes made by the user as well as all data on the user's PC. The hacker than uses the information gleaned to social engineer his way into getting close to his victim.The hacker also employs tactics that were used by Jonathan Littman and Kevin Mitnick to reroute phone switches so he can break into virtually any call. The hacker also has an array of other nasty Internet tools like encryption and password crackers. What makes the whole thing really scary is that many of the tools are available as shareware on the Internet so it might not be so hard for a "sick" individual to carry out some of the things he does.A must read for those in the computer security field!