Discussion
Match each term with what it describes.
List I
A. Authentication
B. Authorisation
C. Auditing
D. Accounting
List II
1. recording what the principal actually did
2. establishing who the principal is
3. attributing resource usage to the principal
4. deciding what that principal may do
Answer: A
Correct answer: A-2, B-4, C-1, D-3
The four A words in order. Authentication establishes who the principal is; authorisation decides what that principal may do; auditing records what they actually did; and accounting attributes the resource usage to them. Keeping the first two apart matters most in practice, since a great many incidents involve a correctly authenticated principal doing something it should never have been permitted to do.
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