Safety and Consistency in Policy-Based Authorization Systems

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Provided by: Association for Computing Machinery
Topic: Security
Format: PDF
In trust negotiation and other distributed proving systems, networked entities cooperate to form proofs that are justified by collections of certified attributes. These attributes may be obtained through interactions with any number of external entities and are collected and validated over an extended period of time. Though these collections of credentials in some ways resemble partial system snapshots, these systems currently lack the notion of a consistent global state in which the satisfaction of authorization policies should be checked. In this paper, the authors argue that unlike the notions of consistency studied in other areas of distributed computing, the level of consistency required during policy evaluation is predicated solely upon the security requirements of the policy evaluator.
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