With its lively, conversational tone and practical focus, this new edition mixes applied and theoretical aspects for a solid introduction to cryptography and security, including the latest significant advancements in the field.

1 Overview Secure Communications. Cryptographic Applications 2 Classical Cryptosystems. Shift Ciphers. Affine Ciphers. The Vigen`ere Cipher. Substitution Ciphers. Sherlock Holmes. The Playfair and ADFGX Ciphers. Block Ciphers. Binary Numbers and ASCII. One-Time Pads. Pseudo-random Bit Generation. LFSR Sequences. Enigma. Exercises. Computer Problems. 3 Basic Number Theory. Basic Notions. Solving ax + by = d. Congruences. The Chinese Remainder Theorem. Modular Exponentiation. Fermat and Euler. Primitive Roots. Inverting Matrices Mod n. Square Roots Mod n. Legendre and Jacobi Symbols. Finite Fields. Continued Fractions. Exercises. Computer Problems. 4 The Data Encryption Standard Introduction. A Simplified DES-Type Algorithm. Differential Cryptanalysis. DES. Modes of Operation. Breaking DES. Meet-in-the-Middle Attacks. Password Security. Exercises. 5 AES: Rijndael The Basic Algorithm. The Layers. Decryption. Design Considerations. 6 The RSA Algorithm The RSA Algorithm. Attacks on RSA. Primality Testing. Factoring. The RSA Challenge. An Application to Treaty Verification. The Public Key Concept. Exercises. Computer Problems 7 Discrete Logarithms Discrete Logarithms. Computing Discrete Logs. Bit Commitment Diffie-Hellman Key Exchange. ElGamal Public Key Cryptosystems. Exercises. Computer Problems. 8 Hash Functions Hash Functions. A Simple Hash Example. The Secure Hash Algorithm. Birthday Attacks. Multicollisions. The Random Oracle Model. Using Hash Functions to Encrypt. 9 Digital Signatures RSA Signatures. The ElGamal Signature Scheme. Hashing and Signing. Birthday Attacks on Signatures. The Digital Signature Algorithm. Exercises. Computer Problems. 10 Security Protocols Intruders-in-the-Middle and Impostors. Key Distribution. Kerberos Public Key Infrastructures (PKI). X.509 Certificates. Pretty Good Privacy. SSL and TLS. Secure Electronic Transaction. Exercises. 11 Digital Cash Digital Cash. Exercises. 12 Secret Sharing Schemes Secret Splitting. Threshold Schemes. Exercises. Computer Problems. 13 Games Flipping Coins over the Telephone. Poker over the Telephone. Exercises. 14 Zero-Knowledge Techniques The Basic Setup. The Feige-Fiat-Shamir Identification Scheme. Exercises. 15 Information Theory Probability Review. Entropy. Huffman Codes. Perfect Secrecy. The Entropy of English. Exercises. 16 Elliptic Curves The Addition Law. Elliptic Curves Mod n. Factoring with Elliptic Curves. Elliptic Curves in Characteristic 2. Elliptic Curve Cryptosystems. Identity-Based Encryption. Exercises. Computer Problems. 17 Lattice Methods Lattices. Lattice Reduction. An Attack on RSA. NTRU. Exercises 18 Error Correcting Codes Introduction. Error Correcting Codes. Bounds on General Codes. Linear Codes. Hamming Codes. Golay Codes. Cyclic Codes. BCH Codes. Reed-Solomon Codes. The McEliece Cryptosystem. Other Topics. Exercises. Computer Problems. 19 Quantum Techniques in Cryptography A Quantum Experiment. Quantum Key Distribution. Shor’s Algorithm. 4 Exercises. Mathematica Examples Maple Examples MATLAB Examples Further Reading Bibliography Index

• New problems in Chs. 3 and 6 – Offers instructors an expanded problem set.   • Sections on Legendre and Jacobi symbols and Continued Fractions in Ch. 3 – Allows instructors to cover more advanced material (such as an attack on RSA) in later chapters.   • More modes of operation in Ch. 4 – Completes the discussion of block ciphers.   • Additional attacks on RSA – Makes students aware of the strengths and shortcomings of this popular scheme.   • New material on hash functions – Expands the coverage of these important cryptographic primitives, including recent advancements relevant to the security profession.   • Updated discussion of multicollisions – Keeps students up-to-date on events that will have a significant impact on security systems over the next few years.