Understanding Computer Network Security

Before we talk about network security, we need to understand in general terms what security is. Security is a continuous process of protecting an object from unauthorized access. It is as state of being or feeling protected from harm. That object in that

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The Computer Communications and Networks series is a range of textbooks, monographs and handbooks. It sets out to provide students, researchers and non-specialists alike with a sure grounding in current knowledge, together with comprehensible access to the latest developments in computer communications and networking. Emphasis is placed on clear and explanatory styles that support a tutorial approach, so that even the most complex of topics is presented in a lucid and intelligible manner.

Joseph Migga Kizza

Guide to Computer Network Security Second Edition

Joseph Migga Kizza Department of Computer Science and Engineering University of Tennessee-Chattanooga Chattanooga Tennessee, USA

Series Editor

A.J. Sammes Centre for Forensic Computing Cranfield University, Shrivenham campus Swindon, UK

ISSN 1617-7975 ISBN 978-1-4471-4542-4 ISBN 978-1-4471-4543-1 (eBook) DOI 10.1007/978-1-4471-4543-1 Springer London Heidelberg New York Dordrecht Library of Congress Control Number: 2012954091 © Springer-Verlag London 2009, 2013 This work is subject to copyright. All rights are reserved by the Publisher, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting, reproduction on microfilms or in any other physical way, and transmission or information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed. Exempted from this legal reservation are brief excerpts in connection with reviews or scholarly analysis or material supplied specifically for the purpose of being entered and executed on a computer system, for exclusive use by the purchaser of the work. Duplication of this publication or parts thereof is permitted only under the provisions of the Copyright Law of the Publisher’s location, in its current version, and permission for use must always be obtained from Springer. Permissions for use may be obtained through RightsLink at the Copyright Clearance Center. Violations are liable to prosecution under the respective Copyright Law. The use of general descriptive names, registered names, trademarks, service marks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use. While the advice and information in this book are believed to be true and accurate at the date of publication, neither the authors nor the editors nor the publisher can accept any legal responsibility for any errors or omissions that may be made. The publisher makes no warranty, express or implied, with respect to the material contained herein. Printed on acid-free paper Springer is part of Springer Science+Business Media (www.springer.com)

To the Trio: Immaculate, Josephine, and Florence

Preface to Second Edition

Since the publication of the first edition of this book, there