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Security Goals
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he two main objectives in the first three chapters of this book are to establish the key goals of computer security and to provide an overview of the core principles of secure systems design. 1 focuses on the role that technological security plays in the design of a large secure system, and the seven key concepts in the field of security: Authentication Authorization Confidentiality Data/message integrity Accountability Availability Non-repudiation After discussing these concepts, we will then illustrate the role they play in the scope of a larger system by looking at an example of a web client interacting with a web server, and examining the contribution these key concepts make in that interaction.
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1.1. Security Is Holistic
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Technological security and all the other computer security mechanisms we discuss in this book make up only one component of ensuring overall, holistic security to your system. By technological security, we mean application security, operating system (OS) security, and network security. In addition to discussing what it means to have application, OS, and network security, we will touch upon physical security, and policies and procedures. Achieving holistic security requires physical security, technological security, and good policies and procedures. Having just one or two of these types of security is usually not sufficient to achieve security: all three are typically required. An organization that has advanced technological security mechanisms in place but does not train its employees to safeguard their passwords with care will not be secure overall. The bulk of this book focuses on technological security, and we briefly comment on physical security and policies and procedures in this chapter, as security is holistic. However, our coverage of physical security and policies and procedures do not do the topics justice for more information, we would encourage you to do the following:
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CHAPTER 1 s SECURITY GOALS
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Read standards such as ISO 17799 (see www.iso.org/iso/en/prods-services/popstds/ informationsecurity.html and www.computersecuritynow.com). Visit sites such as the SANS Security Policy Project (www.sans.org/resources/policies) for more information on security policies and procedures. Read Practical UNIX and Network Security, by Simson Garfinkel, Gene Spafford, and Alan Schwartz, for more on operating system and network security.
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1.1.1. Physical Security
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Physically securing your system and laying down good policies for employees and users is often just as important as using the technological security mechanisms that we cover in this book. All of your servers should be behind locked doors, and only a privileged set of employees (typically system and security administrators) should have access to them. In addition, data centers used to house farms of servers can employ cameras, card reader and biometric locks, and even vaults of various kinds, depending upon the sensitivity of data stored on the servers. In addition to mechanisms that limit access to a physical space to prevent asset theft and unauthorized entry, there are also mechanisms that protect against information leakage and document theft. Documents containing sensitive information can be shredded before they re disposed of so that determined hackers can be prevented from gathering sensitive information by sifting through the company s garbage. Such an attack is often referred to as dumpster diving.
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1.1.2. Technological Security
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In addition to physical security, there are many technical levels of security that are important. Technological security can be divided into three components: application security, OS security, and network security. Note that our use of the word technological to group together application, OS, and network security may not be the best of terms! Clearly, various types of technology can also be used to achieve physical security. For example, employees can be given electronic badges, and badge readers can be put on the door of the server room. The badges and readers clearly employ technology but here, we use the term technological security to refer to softwarerelated application, OS, and network security technology.
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