In this book, readers will learn expert tips to make sure their passwords are secure and their log-in information is safe. They'll also learn more about the cyberwar that happens every day on the Internet as security experts and malicious hackers do battle. Topics include passwords, encryption, network security, and cyberterrorism. Readers will also learn about the power and importance of really, really big prime numbers. Diagrams and accessible text help make this the perfect guide to digital security-readers will decode the secrets of this book and see if they can crack the security code embedded within.