While you're reading this, a hacker could be prying and spying his way into your company's IT systems, sabotaging your operations, stealing confidential information, shutting down your Web site, or wreaking havoc in other diabolical ways. Hackers For Dummies helps you hack into a hacker's mindset and take security precautions to help you avoid a hack attack. It outlines computer hacker tricks and techniques you can use to assess the security of your own information systems, find security vulnerabilities, and fix them before malicious and criminal hackers can exploit them. It covers:Hacking methodology and researching public information to see what a hacker can quickly learn about your operationsSocial engineering (how hackers manipulate employees to gain information and access), physical security, and password vulnerabilitiesNetwork infrastructure, including port scanners, SNMP scanning, banner grabbing, scanning, and wireless LAN vulnerabilitiesOperating systems, including Windows, Linux, and Novell NetWareApplication hacking, including malware (Trojan horses, viruses, worms, rootkits, logic bombs, and more), e-mail and instant messaging, and Web applicationsTests, tools (commercial, shareware, and freeware), and techniques that offer the most bang for your ethical hacking buckWith this guide you can develop and implement a comprehensive security assessment plan, get essential support from management, test your system for vulnerabilities, take countermeasures, and protect your network infrastructure. You discover how to beat hackers at their own game, with:A hacking toolkit, including War dialing software, password cracking software, network scanning software, network vulnerability assessment software, a network analyzer, a Web application assessment tool, and moreAll kinds of countermeasures and ways to plug security holesA list of more than 100 security sites, tools, and resourcesEthical hacking helps you fight hacking with hacking, pinpoint security flaws within your systems, and implement countermeasures. Complete with tons of screen shots, step-by-step instructions for some countermeasures, and actual case studies from IT security professionals, this is an invaluable guide, whether you're an Internet security professional, part of a penetration-testing team, or in charge of IT security for a large or small business.