System Security: Software & OS

Question 1

What is the Bell-LaPadula model?

Answer 1

A state machine model for enforcing sound access control.

Question 2

In the Bell-LaPadula model, what is the Simple Security property?

Answer 2

The Simple Security Property states that a subject at a given security level may not read an object at a higher security level.

Question 3

In the Bell-LaPadula model, what is the *-property? (star property)

Answer 3

The * (Star) Security Property states that a subject at a given security level may not write to any object at a lower security level.

Question 4

What is the Chinese Wall Model?

Answer 4

A model developed for commercial applications in which conflicts of interest can arise.

Subjects are only allowed to access information that is not held to conflict with any other information that they have had access to.