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  1. Proceedings of the 8th Symposium on Identity and Trust on the Internet (IDtrust '09)
  2. A calculus of trust and its application to PKI and identity management
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A calculus of trust and its application to PKI and identity management

Content Provider ACM Digital Library
Author Nicol, David Huang, Jingwei
Abstract We introduce a formal semantics based calculus of trust that explicitly represents trust and quantifies the risk associated with trust in public key infrastructure (PKI) and identity management (IdM). We then show by example how to formally represent trust relationships and quantitatively evaluate the risk associated with trust in public key certificate chains. In the context of choosing a certificate chain, our research shows that the shortest chain need not be the most trustworthy, and that it may make sense to compare the trustworthiness of a potential chain against a threshold to govern acceptance, changing the problem to finding a chain with sufficiently high trustworthiness. Our calculus also shows how quantified trust relationships among CAs can be combined to achieve an overall trust assessment of an offered certificate.
Starting Page 23
Ending Page 37
Page Count 15
File Format PDF
ISBN 9781605584744
DOI 10.1145/1527017.1527021
Language English
Publisher Association for Computing Machinery (ACM)
Publisher Date 2009-04-14
Publisher Place New York
Access Restriction Subscribed
Subject Keyword Uncertainty Semantics of trust Risk assessment Social networks Trust modeling Pki Identity management
Content Type Text
Resource Type Article
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