ISSN : 1796-203X
Volume : 1    Issue : 7    Date : October/November 2006

Building a Virtual Hierarchy for Managing Trust Relationships in a Hybrid Architecture
Cristina Satizábal, Rafael Páez, and Jordi Forné
Pages: 60-68
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Trust models provide a framework to create and manage trust relationships among the different
entities of a Public Key Infrastructure (PKI). These trust relationships are verified through the
certification path validation process, which involves: path discovery, signature verification and
revocation status checking. When trust relationships are bidirectional, multiple paths can exist
between two entities, which increase the runtime of the path discovery process. In addition, validation
of long paths can be difficult, especially when storage and processing capacities of the verifier are
limited. In this paper, we propose a protocol to establish a hierarchical trust model from a hybrid PKI.
This protocol makes more efficient certification path discovery since in a hierarchical model, trust
relationships are unidirectional and paths are easy to find. In addition, our protocol does not require
issuing new certificates and allows setting a maximum path length, so it can be adapted to the
features of users’ terminals.

Index Terms
certification path discovery, hierarchical trust model, hybrid trust model, Public Key Infrastructure (PKI).