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Overview of Information System Security: Confidentiality Policies and Lattices

This chapter provides an in-depth review of information system security focusing on confidentiality policies. It explores the Bell-LaPadula (BLP) model, including security clearance and classification processes, and discusses the significance of categories in military systems. The text delves into POsets (Partially Ordered Sets) as a foundational concept, outlining their definitions and properties such as reflexivity, transitivity, and anti-symmetry. Additionally, it reviews the tranquility controversy, highlighting the implications of these systems on information security.

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Overview of Information System Security: Confidentiality Policies and Lattices

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    1. 1 ISA 662 Information System Security Confidentiality Policies Chapter 5

    2. 2 Overview Review and background Review - lattices Military systems and Dennings Axioms Bell-LaPadula (BLP) Policy Step 1 clearance/classification Step 2 categories Example System DG/UX Tranquility Controversy at a glance

    3. 3 POsets Definition: A Poset (short hand for Partially Ordered Set) is a pair (A,<) where A is a set < is a partial order. That is < is reflexive: x<x for xeA < is transitive: x<y and y<z ?x<z for all x,y,zeA < is anti-symmetric: x<y and y<x ?x=y for all x,yeA Example: A B C D E < is a total order iff x<y ?x,yeA

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