An ideal text for introductory information security courses, the third edition of Elementary Information Security provides a comprehensive yet easy-to-understand introduction to the complex world of cyber security and technology. Thoroughly updated with an increased emphasis on mobile devices and technologies, this essential text enables students to gain direct experience by analyzing security problems and practicing simulated security activities. Emphasizing learning through experience, Elementary Information Security, Third Edition addresses technologies and cryptographic topics progressing from individual computers to more complex Internet-based systems.