密码编码学与网络安全(第四版)课后习题_答案..doc

Solutions Manual CRYPTOGRAPHY AND NETWORK SECURITY Principles and Practice Fourth Edition William Stallings Copyright 2006: William Stallings  ? 2006 by William Stallings All rights reserved. No part of this document may be reproduced, in any form or by any means, or posted on the Internet, without permission in writing from the author.  Notice This manual contains solutions to all of the review questions and homework problems in Cryptography and Network Security, Fourth Edition. If you spot an error in a solution or in the wording of a problem, I would greatly appreciate it if you would forward the information via email to ws@. An errata sheet for this manual, if needed, is available at /members/w/s/ws/S. W.S. TABLE OF CONTENTS Chapter 1: Introduction 5 Chapter 2: Classical Encryption Techniques 7 Chapter 3: Block Ciphers and the Date Encryption Standard 13 Chapter 4: Finite Fields 21 Chapter 5: Advanced Encryption Standard 28 Chapter 6: More on Symmetric Ciphers 33 Chapter 7: Confidentiality Using Symmetric Encryption 38 Chapter 8: Introduction to Number Theory 42 Chapter 9: Public-Key Cryptography and RSA 46 Chapter 10: Key Management; Other Public-Key Cryptosystems 55 Chapter 11: Message Authentication and Hash Functions 59 Chapter 12: Hash and MAC Algorithms 62 Chapter 13: Digital Signatures and Authentication Protocols 66 Chapter 14: Authentication Applications 71 Chapter 15: Electronic Mail Security 73 Chapter 16: IP Security 76 Chapter 17: Web Security 80 Chapter 18: Intruders 83 Chapter 19: Malicious Software 87 Chapter 20: Firewalls 89 Chapter 1 Introduction Answers to Questions 1.1 The OSI Security Architecture is a framework that provides a systematic way of defining the requirements for security and characterizing the approaches to satisfying those requirements. The document defines security attacks, mechanisms, and services, and the relationships among these categories. 1.2 Passi