List all processes and subjects in a matrix
A11 A12 A13 … A1n
A21 A22 A23 … A2n
A31 A32 A33 … A3n
.
.
Am1 Am2 Am3 … Amn
List each object in a column and row
Access control matrix is large
How do we represent it in the system?
Column for object Oi is [(ul1, right1),(ui2, right2),…]
called access control list or ACL
Associated with each resource
For user ui, a row in the matrix is [(oil1, righ1),(oi2,righs2)…]
Called a capability-list or C-list
such a C-list stored for each user
ACLs
x->[(A,rwx)]
y->[(A,r)(B,rw)(c,rw)]
z->[(B,rx)(C,rx)]
C-lists
A->[(X,rwx)(y,r)]
B->[(y,rw)(Z,rx)]
C->[(y,rw)(Z,rx)]
