Representation of Trust Model using RDBMs

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Representation of Trust Model using RDBMs

• Priyank Sharma Colorado State University

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The Trust Model

• The notion of trust plays a crucial role for the
  proper formulation of security policies.
• A trust management system is a comprehensive
  framework designed to facilitate the spec.,
  analysis, and management of trust relationship.
• This model proposed trust to be represented using
  a vector of 3 values Knowledge, Experience,
  Recommendation.
• - by Sudip
  Chakraborty

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Trust QL

• In order to use Trust Management System, a Trust
  Query Language is developed.
• Query examples
• CREATE ENTITY entity_name
• SELECT TRUST BETWEEN E1 AND E2 CONTEXT
  context_name POLICY policy_name

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RDBMS Implementation(1)

• In order to these query to be run, they are
  transformed into corresponding database
  operation.
• Like for query CREATE ENTITY entity_name
• Corresponding database operation should be
• INSERT INTO ENTITY entity_name
• To implement these sort of operation a database
  is created with tables like ENTITY, CONTEXT,
  TRUST, KNOWLEDGE etc.

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RDBMS Implementation(2)

• Database is already prepared.
• We need a compiler that maps these trust query
  into database operations.
• Approach should be to prepare the Lexical
  analyzer first, for token generation, and then
  during parsing an intermediate form (which is
  nothing but database operation) are generated and
  applied on the database.