In your OWN words:

1. Define computer security.

2. What is the difference between passive and active security threats?

3. explain the difference between an attack surface and an attack tree

4. Consider an automated teller machine (ATM) in which users provide a personal identification number

(PIN) and a card for account access. Give examples of confidentiality, integrity, and availability

requirements associated with the system and, in each case, indicate the degree of importance of the

requirement.