Security Architecture Models

Security Architecture Models in CISSP provide structured frameworks for implementing security mechanisms in an information system. The Bell-LaPadula Model focuses on confidentiality by preventing unauthorized access through "no read up, no write down" principles - subjects cannot read objects at higher security levels or write to lower ones. The Biba Integrity Model protects data integrity with its "no read down, no write up" approach, preventing contamination from lower integrity levels. The Clark-Wilson Model emphasizes transaction integrity using well-formed transactions and separation of duties. The Brewer-Nash (Chinese Wall) Model prevents conflicts of interest by restricting access after initial choices. The Graham-Denning Model defines eight protection rules for subject-object operations. The Harrison-Ruzzo-Ullman Model addresses rights amplification risks. The Take-Grant Model uses directed graphs to analyze permission transfers. The Goguen-Meseguer Model focuses on noninterference to ensure high-level actions don't affect lower-level users. The Sutherland Model emphasizes integrity through assurances that information only flows according to permitted channels. Common Criteria provides standardized security evaluation frameworks with Evaluation Assurance Levels (EALs). TCSEC (Orange Book) classifies systems into security divisions (A-D). Information flow models track data movement through systems to ensure proper handling. Reference monitors enforce access control decisions, forming the basis of the security kernel in trusted systems. Understanding these models helps security professionals implement appropriate controls based on system security requirements.

Security Architecture Models in CISSP provide structured frameworks for implementing security mechanisms in an information system. The Bell-LaPadula Model focuses on confidentiality by preventing una…

Concepts covered: Take-Grant Protection Model, Brewer-Nash Model, Sandhu-Ferraiolo Model, Harrison-Ruzzo-Ullman Model, Graham-Denning Model, Role-Based Access Control Model, Non-Interference Model, Biba Model, Rule-Based Access Control Model, Bell-LaPadula Model, Lattice-Based Access Control Model, Clark-Wilson Model