In our previous blog we discussed about Open and Closed system. Continuing with our discussion on Domain 3; Lets understand the security mechanism used in such system.

1. Process Confinement aka Sandboxing.
2. Bounds
3. Isolation
4. Access Controls
5. Defense in depth
6. Trust & Assurance.

Security Modes

A mandatory access control (MAC) system operates in different security modes at various times, based on variables such as

• Sensitivity of data
• The clearance level of the user
• The actions users are authorized to take

There are four different modes.

1. Dedicated security mode
2. System High Security mode
3. Compartmented Security mode
4. Multilevel Security mode

Refer to below picture for detail descriptions of these modes.