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The use of credential directories in PKI and authorization systems such as
Shibboleth introduces a new privacy risk: an insider at the directory can learn
much about otherwise protected interactions by observing who makes queries, and
what they ask for. Recent advances in Practical Private Information Retrieval
provide promising countermeasures. In this paper, we extend this technology to
solve this new privacy problem, and present a design and preliminary prototype
for a LDAP-based credential service that can prevent even an insider from
learning anything more than the fact a query was made. Our preliminary
performance analysis suggests that the complete prototype may be sufficiently
robust for academic enterprise settings.
Submitted to the 2nd Annual PKI Research Workshop.
Bibliographic citation for this report: [plain text] [BIB] [BibTeX] [Refer]
Or copy and paste:
Alex Iliev and Sean Smith, "Privacy-enhanced credential services." Dartmouth Computer Science Technical Report TR2003-442, February 2003.
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