Explore the foundational principles of cryptography and security with this comprehensive guide from The Bookish Owl. Designed for clarity and depth, this book delves into essential topics including symmetric and asymmetric key cryptography, elliptic curve cryptography, hashing functions, message authentication, and digital signatures. Understand the critical security issues at application, transport, and network layers, along with detailed explanations of threats and countermeasures. Perfect for students and professionals seeking a solid understanding of modern security concepts and relevant standards. This essential resource provides the in-depth knowledge needed to navigate the complex world of digital security.