Security Architecture And Design

Security Architecture And Design

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Chapter #11 from the textbook

In today’s fast-paced, often “agile” software development, how can the secure design be implemented?

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ecuring Systems

Applied Security Architecture and Threat Models

Securing Systems

Applied Security Architecture and Threat Models

Brook S.E. Schoenfield Forewords by John N. Stewart and James F. Ransome

CRC Press Taylor & Francis Group 6000 Broken Sound Parkway NW, Suite 300 Boca Raton, FL 33487-2742

© 2015 by Taylor & Francis Group, LLC CRC Press is an imprint of Taylor & Francis Group, an Informa business

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v

To the many teachers who’ve pointed me down the path; the managers who have sup- ported my explorations; the many architects and delivery teams who’ve helped to refine the work; to my first design mentors—John Caron, Roddy Erickson, and Dr. Andrew Kerne—without whom I would still have no clue; and, lastly, to Hans Kolbe, who once upon a time was our human fuzzer.

Each of you deserves credit for whatever value may lie herein. The errors are all mine.

Dedication

vii

Contents

Dedication v

Contents vii

Foreword by John N. Stewart xiii

Foreword by Dr. James F. Ransome xv

Preface xix

Acknowledgments xxv

About the Author xxvii

Part I Introduction 3

The Lay of Information Security Land 3 The Structure of the Book 7 References 8

Chapter 1: Introduction 9

1.1 Breach! Fix It! 11 1.2 Information Security, as Applied to Systems 14 1.3 Applying Security to Any System 21 References 25

Chapter 2: The Art of Security Assessment 27

2.1 Why Art and Not Engineering? 28 2.2 Introducing “The Process” 29

viii Securing Systems

2.3 Necessary Ingredients 33 2.4 The Threat Landscape 35

2.4.1 Who Are These Attackers? Why Do They Want to Attack My System? 36

2.5 How Much Risk to Tolerate? 44 2.6 Getting Started 51 References 52

Chapter 3: Security Architecture of Systems 53

3.1 Why Is Enterprise Architecture Important? 54 3.2 The “Security” in “Architecture” 57 3.3 Diagramming For Security Analysis 59 3.4 Seeing and Applying Patterns 70 3.5 System Architecture Diagrams and Protocol Interchange

Flows (Data Flow Diagrams) 73 3.5.1 Security Touches All Domains 77 3.5.2 Component Views 78

3.6 What’s Important? 79 3.6.1 What Is “Architecturally Interesting”? 79

3.7 Understanding the Architecture of a System 81 3.7.1 Size Really Does Matter 81

3.8 Applying Principles and Patterns to Specific Designs 84 3.8.1 Principles, But Not Solely Principles 96

Summary 98 References 98

Chapter 4: Information Security Risk 101

4.1 Rating with Incomplete Information 101 4.2 Gut Feeling and Mental Arithmetic 102 4.3 Real-World Calculation 105 4.4 Personal Security Posture 106 4.5 Just Because It Might Be Bad, Is It? 107 4.6 The Components of Risk 108

4.6.1 Threat 110 4.6.2 Exposure 112 4.6.3 Vulnerability 117 4.6.4 Impact 121

4.7 Business Impact 122 4.7.1 Data Sensitivity Scales 125

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