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Since the exchange of trust related information utilizes an underlining communication
infrastructure and facilities, evaluation of functionality for trust exchange is focused
on other aspects. The most important aspect of trust exchange is secure and reliable
transmission of trust related information at the message level. Thus the security token
is the cornerstone. Broadly speaking, a number of types of security tokens have been
proposed and implemented using different trust models. These trust models include
the X.509 standard Public Key Infrastructure (PKI) trust model, the Pretty Good
Privacy (PGP) trust model, the Simple Public Key Infrastructure (SPKI), and the
Simple Distributed Secure Infrastructure (SDSI). The network router configuration capability to accommodate
extant security tokens and future token types is an important aspect for any federated
trust management system. To measure this aspect, expert judgment needs to be used
to answer whether a system's trust exchange facility has an open architecture and to
what degree. It is also required to count the number of extant security token types
supported and answer "which token types are they"?
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