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11

Dependability and security

Objectives
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;
understand that to achieve secure, dependable software, you need to
avoid mistakes during the development of a system, to detect and
remove errors when the system is in use, and to limit the damage
caused by operational failures.

Contents

11.1 Dependability properties
11.2 Availability and reliability
11.3 Safety
11.4 Security