security security

Consider a computer system, where the components are:

users: John (J), Peter (P), and Larry (L)

resources are filel (fl), file2 (f2), and file 3 (f3) access modes are read (r), write (w), and execute (x)

The access control policy P is given as, where all access modes are permissions

P = {(J,fl,r), (J,fl,w), (J,fl,x), (J,f2.r), (J,f3.1), (P,fl,r), (P,f2,1), (P,f2,w), (P,f3,r), (L,f3,w), (L, f2, 1);

1. Show the access control matris that represents P.

2. Describe a technique you would use to enforce the above access control.

3.Suppose the confidentiality goal is that "John does not leak info to Larry". Can this goal be achieved here? Justify your answer.