Cloud computing allows data owners to use massive data storage and vast computation capabilities at a very low price. Despite the benefits, data outsourcing deprives data owners of direct control over their outsourced data. It is common nowadays for data owners to outsource their data to the cloud. Since the cloud cannot be fully trusted, the outsourced data should be encrypted. This however bring s a range of problems, such as: How should a data owner grant search capabilities to the data users? How can the authorize d data users search over a data owner’s outsourced encrypted data? How can the data users be assured that the cloud faithfully executed the search operations on their behalf? In this abstract propose a novel cryptographic solution , called verifiable attribute-based keyword search ( VABKS ). The solution allows a data user, whose credentials satisfy a data owner’s access control policy, to (i) search over the data owner’s outsourced encrypted data, (ii) outsource the tedious search operatio ns to the cloud, and (iii) verify whether the cloud has faithful ly executed the search operations. We formally define the secur ity requirements of VABKS and describe a construction that satisfies them. Performance evaluation shows that the proposed schem es are practical and deployable.
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