INFO5301 Information Security Management
Security levels are the same. server_room.txt ’s classification [OPR] is a subset of Bob’s
categories [FIN,OPR]. Therefore, Bob dominates server_room.txt .
However, according to “No write Down" rule in Bell-La Padula model, Bob cannot write to
server_room.txt , but Bob can read server_room.txt .
Discussion: 10 mins
Information Security Management Page 5of 5