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Published in:
2011 | OriginalPaper | Chapter
Cooperative Data Access in Multi-cloud Environments
Authors : Meixing Le, Krishna Kant, Sushil Jajodia
Published in: Data and Applications Security and Privacy XXV
Publisher: Springer Berlin Heidelberg
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In this paper, we discuss the problem of enabling cooperative query execution in a multi-cloud environment where the data is owned and managed by multiple enterprises. We assume that each enterprise defines a set of
allow rules
to facilitate access to its data, which is assumed to be stored as relational tables. We propose an efficient algorithm using join properties to decide whether a given query will be allowed. We also allow enterprises to explicitly forbid access to certain data via
deny rules
and propose an efficient algorithm to check for conflicts between allow and deny rules.