Cyber Security Questions.

(please google the model Audibility and the second question time-based model. And answer only in 1 paragraph of exactly what is asked.)

(Thanks)

1) Consider the "audibility" security property. Unlike the other properties, a lack of audibility does not necessarily imply a security vulnerability (the degree of audibility of a system does not determine how hard or easy it is to attack). So, what benefit does audibility provide? Why is this an important part of security?

2) Consider the time-based security model described in chapter 2 of the book. This is clearly an improvement over the fortress model, but it is still not sufficient. Describe one downside or issue of the time-based security model