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Flow Structures and the FSQ Framework:

Flow Structures and the FSQ Framework: A Basis for System Survivability Specification and Design. CERT/Coordination Center Software Engineering Institute Carnegie Mellon University Pittsburgh, PA 15213 Sponsored by the U.S. Department of Defense. Eight System Trends.

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Flow Structures and the FSQ Framework:

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  1. Flow Structures and the FSQ Framework: A Basis for System Survivability Specification and Design CERT/Coordination Center Software Engineering Institute Carnegie Mellon University Pittsburgh, PA 15213 Sponsored by the U.S. Department of Defense

  2. Eight System Trends • Ever larger-scale meta-system integration • Massive interconnection • Wholesale interoperability (think XML) • Shift to web services (think .NET) • Dynamic adaptation of functionality • Escalating demand for quality attributes • Increasing consequences of compromise • Growth of complexity impacts human control

  3. The CERT Survivable Network Analysis (SNA) Method Organizational Mission Threat Environment Essential Service Flows Intrusion Flows Architecture Traces Architecture Traces Essential Components Compromisible Components • Flow/trace based method • Successful application • Motivates deeper look at flows for • survivability specification and design Architecture Softspots Survivability Improvements

  4. Three Critical Questions • In the world of shifting meta-system integration and connectivity... • What is the basis for intellectual control over system development and operation? • What is the stable engineering foundation for specification and design? • What is the vehicle for survivability analysis and design?

  5. Flow Structures • Goal • Create stable and practical engineering foundations for the meta-system world of shifting system structures and connections • Observations • Organizational missions are embodied in user task flows that are satisfied by system services • Flows are stable anchors for specification, design, verification, and implementation

  6. Flow Structures • Semantic foundations • Scale-free, referentially-transparent procedural and concurrent primitives refined, abstracted, and verified through compositional methods • Engineering usage • Defined as user-function task-flow specifications annotated with required quality attributes • Refined into designs of system service uses • Relational specifications account for all possible outcomes; a specification is a set of flows

  7. The Flow-Service-Quality Framework • Semantic foundations • FSQ is an architecture template for managing execution of Flow Structure functionality and quality attributes based on dynamic feedback control • Engineering usage • FSQ architecture mediates Flow Structure function and quality specifications with respect to dynamic system service function and quality properties, to control functional flow execution and satisfy quality specifications

  8. FSQ Framework: Engineering View

  9. FSQ Framework: Operations View FSQ Framework: Enginering View

  10. Current Research • Survivability attributes • Focus on incorporation of survivability attributes into Flow Structure and system service specifications and designs • Computational survivability • Focus on treating survivability as a function to be computed, with dynamic system responses to varying survivability properties for flow management

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