Introduction -- Symmetric-Key Encryption -- Public-Key Cryptography -- Cryptographic Protocols -- Probabilistic Algorithms -- One-Way Functions and the Basic Assumptions -- Bit Security of One-Way Functions -- One-Way Functions and Pseudorandomness -- Provably Secure Encryption -- Unconditional Security of Cryptosystems -- Provably Secure Digital Signatures -- App. A, Algebra and Number Theory -- App. B, Probabilities and Information Theory -- References -- Index.