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Using Ontologies to Mitigate LDAP Deficiencies

Semantic technology powered access control schemes have been recently proposed to enhance the flexibility of role-based access control (RBAC) and its variants. These access control mechanisms depend heavily on rich, contextual data sourced from an identity attribute store. Unfortunately, most identity stores in use today use the Lightweight Directory Access Protocol (LDAP) representational schema which has several deficiencies as a knowledge representation, particularly when applied to fine-grained, contextual access decision policies. This paper reviews some of these gaps and shows how the same semantic infrastructure used for the access control mechanisms can be employed to mitigate LDAP assumptions.