$1\mathrm{.}1$ Consider an automated teller machine $($ATM$)$ in which users provide aperson: identification number $($PIN$)$ and a card for account access. Give examples of conf dentiality, integrity, and availability requirements associated with the system and, each case, indicate the degree of importance of the requirement.

$1\mathrm{.}2$ Repeat Problem $1\mathrm{.}1$ for a telephone switching system that routes cals through switching network based on the telephone number requested by the caller.