Problem $1(25$ pts$)$

a$)$ 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 avallability requirements associated with the system and, in each case, indicate the degree of Importance of the requirement.

b$)$ With example, explain the different types of attack surface?