Information Assurance

6.4. Dependability, Security, and Their Attributes

The original definition of dependability refers to the ability to deliver a service that can be justifiably trusted. The alternative definition is the ability to avoid service failures that are more frequent and severe than is acceptable. The concept of trust can be defined as accepted dependence, and dependability encompasses the following attributes [7]:

• Availability: Readiness for correct service. The correct service is defined as what is delivered when the service implements a system function.

• Reliability: Continuity of correct service.

• Safety: Absence of catastrophic consequences on the users and environment.

• Integrity: Absence of improper system alterations.

• Maintainability: Ability to undergo ...