"Introduction to Modern Cryptography, Second Edition" by Katz and Lindell provides a comprehensive, mathematically rigorous foundation for understanding modern cryptographic principles, widely adopted in computer science education. The text focuses on formal security definitions, precise assumptions, and proofs, covering topics from symmetric private-key schemes to asymmetric public-key systems and essential number theory. This updated edition features expanded content on block ciphers, elliptic curve cryptography (ECC), and real-world attacks, offering an essential, up-to-date resource for students and practitioners. You can purchase the book through CRC Press or Amazon .