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Security '01 Abstract
Secure Distribution of Events in Content-Based Publish Subscribe Systems
Lukasz Opyrchal and Atul Prakash, Electrical Engineering and Computer Science Department,
University of Michigan
Abstract
Content-based publish-subscribe systems are an emerging paradigm for building
a range of distributed applications. A specific problem in content-based
systems is the secure distribution of events to clients subscribing to
those events. In content-based systems, every event can potentially have
a different set of interested subscribers. To provide confidentiality guarantee,
we would like to encrypt messages so that only interested subscribers can
read the message. In the worst case, for n clients, there can be 2n subgroups,
and each event can go to a potentially different subgroup. A major problem
is managing subgroup keys so that the number of encryptions required per
event can be kept low. We first show the difficulties in applying existing
group key management techniques to addressing the problem. We then propose
and compare a number of approaches to reduce the number of encryptions
and to increase message throughput. We present analytical analysis of described
algorithms as well as simulation results.
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