This book is designed to provide real-world solutions to real-world problems. You will learn how to secure both client and server software from known attacks, and how to take a proactive stance against possible new attacks. From learning about encrypting e-mail messages with Pretty Good Privacy (PGP) to using anti-virus and personal firewall software, to actually securing your operating system from attack, this book is designed to provide a comprehensive solution. Before you learn more about how to scan e-mail attachments and encrypt transmissions, you should first learn about some of the basics.