Information Security | Models Pdf
| Model | Primary Goal | Access Rule Summary | Typical Domain | |---------------|--------------------|-------------------------------|-------------------------| | Bell-LaPadula | Confidentiality | No read up, no write down | Military, classified | | Biba | Integrity | No read down, no write up | Data integrity-critical | | Clark-Wilson | Integrity (commercial) | Well-formed transactions | Banking, ERP | | RBAC | Both (policy-neutral)| Roles & permissions | Enterprises, apps | | Brewer-Nash | Conflict avoidance | Dynamic wall based on history | Consulting, finance |
Focus: Access control matrix theory. The Concept: The HRU model defines a system as a set of subjects, objects, and rights. It introduces commands (with conditions) that allow changes to the access matrix itself. Key Takeaway: HRU proves that the general question "Can a subject gain an unauthorized right?" is undecidable (the Safety Problem). Information Security Models Pdf
Use Case: Theoretical computer science and operating system design. Available PDF Content: The 1976 paper "Protection in Operating Systems" by Harrison, Ruzzo, and Ullman. This is a dense, math-heavy PDF suitable for graduate-level research. | Model | Primary Goal | Access Rule
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Key Principles:
| Feature | Description | | :--- | :--- | | Foundational Models | Detailed explanations of CIA Triad (Confidentiality, Integrity, Availability), DAD (Disclosure, Alteration, Denial), and Parkerian Hexad. | | Access Control Models | Breakdown of DAC (Discretionary), MAC (Mandatory), RBAC (Role-Based), and ABAC (Attribute-Based) with real-world examples. | | Architectural & Framework Models | Bell–LaPadula (confidentiality focus), Biba (integrity focus), Clark-Wilson (commercial integrity), Brewer & Nash (Chinese Wall). | | Governance & Risk Models | ISO/IEC 27001 controls mapping, NIST SP 800-53 overlay, COBIT alignment, and FAIR (quantitative risk analysis). | | Threat Modeling Models | STRIDE (Microsoft), PASTA, Trike, VAST, and Attack Trees explained with diagrams. | | Comparative Matrix | A visual table comparing each model by: primary goal (confidentiality/integrity/availability), industry use case, strengths, and limitations. | | Case Studies | Real-world breaches mapped to which model would have prevented/mitigated them (e.g., Target breach → RBAC + Bell-LaPadula). | Key Principles:
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