TAILIEUCHUNG - Lecture Software engineering (9/e): Chapter 11 - Sommerville

Chapter 11 – Security and dependability. The objective of this chapter is to introduce software dependability and security. When you have read this chapter, you will: understand why dependability and security are usually more important than the functional characteristics of a software system; understand the four principal dimensions of dependability, namely availability, reliability, safety, and security; be aware of the specialized terminology that is used when discussing security and dependability;. | Chapter 11 – Security and Dependability Lecture 1 1 Chapter 11 Security and Dependability Topics covered Dependability properties The system attributes that lead to dependability. Availability and reliability Systems should be available to deliver service and perform as expected. Safety Systems should not behave in an unsafe way. Security Systems should protect themselves and their data from external interference. System dependability For many computer-based systems, the most important system property is the dependability of the system. The dependability of a system reflects the user’s degree of trust in that system. It reflects the extent of the user’s confidence that it will operate as users expect and that it will not ‘fail’ in normal use. Dependability covers the related systems attributes of reliability, availability and security. These are all inter-dependent. 3 Chapter 11 Security and Dependability Importance of dependability System failures may have widespread effects with .

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