Serious Cryptography is the highly anticipated overview of modern cryptography by cryptographer JP Aumasson. This book is aimed at readers who want to understand how cryptography works in today's world. It is suitable for a broad audience and includes mathematical concepts as well as in-depth discussions on how various cryptographic mechanisms function. The chapters cover the notion of secure encryption, randomness, block ciphers and stream ciphers, hash functions, and message authentication codes, public-key cryptography including RSA, Diffie-Hellman, and elliptic curves, as well as TLS and post-quantum cryptography. Numerous code examples and real-world use cases help practitioners grasp the core concepts of modern cryptography, make the best algorithm or protocol choices, and ask the right questions to vendors. Aumasson discusses fundamental concepts such as computational security.