# Modern Cryptography : Theory and Practice

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## Description

Leading HP security expert Wenbo Mao explains why "textbook" crypto schemes, protocols, and systems are profoundly vulnerable by revealing real-world-scenario attacks. Next, he shows how to realize cryptographic systems and protocols that are truly "fit for application"--and formally demonstrates their fitness. Mao presents practical examples throughout and provides all the mathematical background you'll need. Coverage includes: Crypto foundations: probability, information theory, computational complexity, number theory, algebraic techniques, and more Authentication: basic techniques and principles vs. misconceptions and consequential attacks Evaluating real-world protocol standards including IPSec, IKE, SSH, TLS (SSL), and Kerberos Designing stronger counterparts to vulnerable "textbook" crypto schemes Mao introduces formal and reductionist methodologies to prove the "fit-for-application" security of practical encryption, signature, signcryption, and authentication schemes. He gives detailed explanations for zero-knowledge protocols: definition, zero-knowledge properties, equatability vs. simulatability, argument vs. proof, round-efficiency, and non-interactive versions.

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## Product details

- Hardback | 648 pages
- 164 x 238 x 38mm | 1,319.95g
- 04 Aug 2003
- Pearson Education (US)
- Prentice Hall
- Upper Saddle River, United States
- English
- 0130669431
- 9780130669438

## Back cover copy

"This book would be a good addition to any cryptographer's bookshelf. The book is self-contained; it presents all the background material to understand an algorithm and all the development to prove its security. I'm not aware of another book that's as complete as this one." --Christian Paquin, Cryptographic/Security Developer, Silanis Technology Inc. "The book is both complete, and extraordinarily technically accurate. It would certainly be a useful addition to any cryptographer's or crypto-engineer's library." --Marcus Leech, Advisor, Security Architecture and Planning, Nortel Networks Build more secure crypto systems--and prove their trustworthiness Modern Cryptography is the indispensable resource for every technical professional who needs to implement strong security in real-world applications. Leading HP security expert Wenbo Mao explains why "textbook" crypto schemes, protocols, and systems are profoundly vulnerable by revealing real-world-scenario attacks. Next, he shows how to realize cryptographic systems and protocols that are truly "fit for application"--and formally demonstrates their fitness. Mao presents practical examples throughout and provides all the mathematical background you'll need. Coverage includes: Crypto foundations: probability, information theory, computational complexity, number theory, algebraic techniques, and more Authentication: basic techniques and principles vs. misconceptions and consequential attacks Evaluating real-world protocol standards including IPSec, IKE, SSH, TLS (SSL), and Kerberos Designing stronger counterparts to vulnerable "textbook" crypto schemes Mao introduces formal and reductionist methodologies to prove the "fit-for-application" security of practical encryption, signature, signcryption, and authentication schemes. He gives detailed explanations for zero-knowledge protocols: definition, zero-knowledge properties, equatability vs. simulatability, argument vs. proof, round-efficiency, and non-interactive versions.

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## About Wenbo Mao

WENBO MAO, PhD, is a Technical Contributor to the Trusted Systems Lab at Hewlett-Packard Laboratories, Bristol, UK. Mao leads HP's participation and research activities in Computer Aided Solutions to Secure Electronic Commerce Transactions (CASENET), a research project funded by the European Union. His research interests include cryptography, computer security, and formal methods. He is a member of the International Association for Cryptographic Research (IACR), the Institute of Electrical and Electronics Engineers (IEEE), and the British Computer Society (BCS).

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## Table of contents

A Short Description of the Book. Preface. List of Figures. List of Algorithms, Protocols and Attacks. I. INTRODUCTION. 1. Beginning with a Simple Communication Game. A Communication Game. Criteria for Desirable Cryptographic Systems and Protocols. Chapter Summary. Exercises. 2. Wrestling between Safeguard and Attack. Introduction. Encryption. Vulnerable Environment (the Dolev-Yao Threat Model). Authentication Servers. Security Properties for Authenticated Key Establishment. Protocols for Authenticated Key Establishment Using Encryption. Chapter Summary. Exercises. II MATHEMATICAL FOUNDATIONS. Standard Notation. 3. Probability and Information Theory. Introduction. Basic Concept of Probability. Properties. Basic Calculation. Random Variables and their Probability Distributions. Birthday Paradox. Information Theory. Redundancy in Natural Languages. Chapter Summary. Exercises. 4. Computational Complexity. Introduction. Turing Machines. Deterministic Polynomial Time. Probabilistic Polynomial Time. Non-deterministic Polynomial Time. Non-Polynomial Bounds. Polynomial-time Indistinguishability. Theory of Computational Complexity and Modern Cryptography. Chapter Summary. Exercises. 5. Algebraic Foundations. Introduction. Groups. Rings and Fields. The Structure of Finite Fields. Group Constructed Using Points on an Elliptic Curve. Chapter Summary. Exercises. 6. Number Theory. Introduction. Congruences and Residue Classes. Euler's Phi Function. The Theorems of Fermat, Euler and Lagrange. Quadratic Residues. Square Roots Modulo Integer. Blum Integers. Chapter Summary. Exercises. III. BASIC CRYPTOGRAPHIC TECHNIQUES. 7. Encryption-Symmetric Techniques. Introduction. Definition. Substitution Ciphers. Transposition Ciphers. Classical Ciphers: Usefulness and Security. The Data Encryption Standard (DES). The Advanced Encryption Standard (AES). Confidentiality Modes of Operation. Key Channel Establishment for Symmetric Cryptosystems. Chapter Summary. Exercises. 8. Encryption-Asymmetric Techniques. Introduction. Insecurity of "Textbook Encryption Algorithms". The Diffie-Hellman Key Exchange Protocol. The Diffie-Hellman Problem and the Discrete Logarithm Problem. The RSA Cryptosystem (Textbook Version). Cryptanalysis Against Public-key Cryptosystems. The RSA Problem. The Integer Factorization Problem. Insecurity of the Textbook RSA Encryption. The Rabin Cryptosystem (Textbook Version). Insecurity of the Textbook Rabin Encryption. The ElGamal Cryptosystem (Textbook Version). Insecurity of the Textbook ElGamal Encryption. Need for Stronger Security Notions for Public-key Cryptosystems. Combination of Asymmetric and Symmetric Cryptography. Key Channel Establishment for Public-key Cryptosystems. Chapter Summary. Exercises. 9. In an Ideal World: Bit Security of the Basic Public-Key Cryptographic Functions. Introduction. The RSA Bit. The Rabin Bit. The ElGamal Bit. The Discrete Logarithm Bit. Chapter Summary. Exercises. 10. Data Integrity Techniques. Introduction. Definition. Symmetric Techniques. Asymmetric Techniques I:Digital Signatures. Asymmetric Techniques II: Data Integrity without Source Identification. Chapter Summary. Exercises. IV. AUTHENTICATION. 11. Authentication Protocols-Principles. Introduction. Authentication and Refined Notions. Convention. Basic Authentication Techniques. Password-based Authentication. Authenticated Key Exchange Based on Asymmetric Cryptography. Typical Attacks on Authentication Protocols. A Brief Literature Note. Chapter Summary. Exercises. 12. Authentication Protocols-The Real World. Introduction. Authentication Protocols for Internet Security. The Secure Shell (SSH) Remote Login Protocol. The Kerberos Protocol and its Realization in Windows 2000. SSL and TLS. Chapter Summary. Exercises. 13. Authentication Framework for Public-Key Cryptography. Introduction. Directory-Based Authentication Framework. Non-Directory Based Public-key Authentication Framework. Chapter Summary. Exercises. V. FORMAL APPROACHES TO SECURITY ESTABLISHMENT. 14. Formal and Strong Security Definitions for Public-Key Cryptosystems. Introduction. A Formal Treatment for Security. Semantic Security-the Debut of Provable Security. Inadequacy of Semantic Security. Beyond Semantic Security. Chapter Summary. Exercises. 15. Provably Secure and Efficient Public-Key Cryptosystems. Introduction. The Optimal Asymmetric Encryption Padding. The Cramer-Shoup Public-key Cryptosystem. An Overview of Provably Secure Hybrid Cryptosystems. Literature Notes on Practical and Provably Secure Public-key Cryptosystems. Chapter Summary. Exercises. 16. Strong and Provable Security for Digital Signatures. Introduction. Strong Security Notion for Digital Signatures. Strong and Provable Security for ElGamal-family Signatures. Fit-for-application Ways for Signing in RSA and Rabin. Signcryption. Chapter Summary. Exercises. 17. Formal Methods for Authentication Protocols Analysis. Introduction. Toward Formal Specification of Authentication Protocols. A Computational View of Correct Protocols-the Bellare-Rogaway Model. A Symbolic Manipulation View of Correct Protocols. Formal Analysis Techniques: State System Exploration. Reconciling Two Views of Formal Techniques for Security. Chapter Summary. Exercises. VI. CRYPTOGRAPHIC PROTOCOLS. 18. Zero-Knowledge Protocols. Introduction. Basic Definitions. Zero-knowledge Properties. Proof or Argument? Protocols with Two-sided-error. Round Efficiency. Non-interactive Zero-knowledge. Chapter Summary. Exercises. 19. Returning To "Coin Flipping over Telephone". Blum's "Coin-Flipping-by-Telephone" Protocol. Security Analysis. Efficiency. Chapter Summary. 20.Afterremark. Bibliography. Subject Index.

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