Information security is the practice of protecting information from unauthorized access, theft, use, modification, disclosure, destruction, or any other form of compromise. It is concerned with both IT security and information assurance, ensuring the confidentiality, integrity, and availability of data. The book studies, analyzes and upholds the pillars of information security and its utmost significance in modern times. It unfolds the innovative aspects of the discipline which will be crucial for the holistic understanding of the subject matter. In this book, constant effort has been made to make the understanding of the difficult concepts of information security as easy and informative as possible, for the readers.