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In trust negotiation approaches to authorization, previously unacquainted entities establish trust in one another gradually via the bilateral and iterative exchange of policies and digital credentials. Although this affords resource providers with an expressive means of access control for open systems, the trust negotiation process incurs non-trivial computational and communications costs. In this paper, the authors propose Receipt-Mode Trust Negotiation (RMTN) as a means of mitigating the performance penalties on servers that use trust negotiation. RMTN provides a means of off-loading the majority of the trust negotiation process to delegated receipt-generating helper servers.
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