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There is a recent trend toward rule-based authorization systems to achieve
flexible security policies. Also, new sensing technologies in pervasive
computing make it possible to define context-sensitive rules, such as ``allow
database access only to staff who are currently located in the main office.''
However, these rules, or the facts that are needed to verify authority, often
involve sensitive context information. This paper presents a secure
context-sensitive authorization system that protects confidential information in
facts or rules. Furthermore, our system allows multiple hosts in a distributed
environment to perform the evaluation of an authorization query in a
collaborative way; we do not need a universally trusted central host that
maintains all the context information. The core of our approach is to decompose
a proof for making an authorization decision into a set of sub-proofs produced
on multiple different hosts, while preserving the integrity and confidentiality
policies of the mutually untrusted principals operating these hosts. We prove
the correctness of our algorithm.
Bibliographic citation for this report: [plain text] [BIB] [BibTeX] [Refer]
Or copy and paste:
Kazuhiro Minami and David Kotz, "Secure Context-sensitive Authorization." Dartmouth Computer Science Technical Report TR2004-529, December 2004.
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