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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 Passive attacks have to do with eavesdropping on, or monitoring, transmi
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