Cryptography plays a key role in ensuring the privacy and integrity of data and the security of computer networks‎.‎ Introduction to Modern Cryptography provides a rigorous yet accessible treatment of modern cryptography‎,‎ with a focus on formal definitions‎,‎ precise assumptions‎,‎ and rigorous proofs‎.‎ The authors introduce the core principles of modern cryptography‎,‎ including the modern‎,‎ computational approach to security that overcomes the limitations of perfect secrecy‎.‎ An extensive treatment of private‎-key encryption and message authentication follows‎.‎ The authors also illustrate design principles for block ciphers‎,‎ such as the Data Encryption Standard ‎(‎DES‎)‎ and the Advanced Encryption Standard ‎(‎AES‎)‎‎,‎ and present provably secure constructions of block ciphers from lower‎-level primitives‎.‎ The second half of the book focuses on public‎-key cryptography‎,‎ beginning with a self‎-contained introduction to the number theory needed to understand the RSA‎,‎ Diffie‎-Hellman‎,‎ El Gamal‎,‎ and other cryptosystems‎.‎ After exploring public‎-key encryption and digital signatures‎,‎ the book concludes with a discussion of the random oracle model and its applications‎.‎ Serving as a textbook‎,‎ a reference‎,‎ or for self‎-study‎,‎ Introduction to Modern Cryptography presents the necessary tools to fully understand this fascinating subject‎.‎