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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.

Windows Workflow Foundation. MVC stands for Model-View-Controller, a pattern that s becoming increasingly popular with web development frameworks. ASP.NET MVC is both an alternative and a complement to Web Forms, which means you won t be dealing with pages and controls, postbacks or view state, or complicated event lifecycles. Instead, you ll be defining controllers, actions, and views. The underlying ASP.NET platform is the same, however, so things like HTTP handlers and HTTP modules still apply, and you can mix MVC and Web Forms pages in the same application. We ll cover all the major features of the framework throughout this book. Here are some of the benefits you ll learn about:

This book uses various typefaces to help you distinguish between GTK+ code and regular English phrases. Actual code is typeset in a monospace font. This can include whole lines of code or function names, signals, and properties in a paragraph. There are other types of conventions used in this book, which follow.

Full control over HTML Full control over URLs Better separation of concerns Extensibility Testability

These boxes show exercises that test your understanding of the material in the section. They can include questions, code challenges, or various other types of material. You should complete each of these exercises before proceeding, because they will help you practice the concepts you have learned throughout the current chapter and put them together with concepts from past chapters.

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:

As you read the chapters in this book, these benefits will become increasingly apparent. For now, we ll briefly look at the underlying pattern the framework is based on. Why MVC Where did it come from

Note These boxes give important notes, tips, and cautions. It is essential that you pay attention to them,

The Model-View-Controller (MVC) pattern is an adaptation of a pattern generated from the Smalltalk community in the 1970s by Trygve Reenskaug. It was popularized for use on the web with the advent of Ruby on Rails in 2003. The components of MVC are straightforward:

Textual output in the terminal is shown in a monospace font between these lines, although most output will be in the form of an image, since GTK+ is graphical.

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.