Information security is a set of processes that defends information from unauthorized accesses, modification or disruption. Information security programs are significant in maintaining the confidentiality of valuable data. The chapters included in this book are a compilation of updated information on topics such as cryptography, biometrics, cloud privacy, etc. It also glances at signal processing and encryption, network security and hardware security. This text is an assimilation of case studies and researches by renowned experts from around the world. As this field is emerging at a rapid pace, the contents of this book will help the readers understand the modern concepts and applications of the subject.