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Trust negotiation is an approach for open systems to the problem of authentication and access control among multiple security domains by allowing parties to use non-forgeable digital credentials to establish trust [3,6]. In this paper we present an extended version of the χ-TNL [1], a complete XML-based trust negotiation language. We believe that the availability of a standard and expressive language for expressing security information is essential for providing a comprehensive and widely-usable environment for carrying on trust negotiations.
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