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Cloud computing provides services like software, computation and storage services for which end-user need not worry about knowledge of the physical location and configuration of the system that delivers the services. Data leakage is a major problem in cloud computing and the privacy of user is under serious threat. The goal of the system is that, server shouldn't have any knowledge on the data it has got and the interests of the user, thus protecting the privacy of the user. Server should not understand the keywords interesting to the user and the documents containing those keywords. The authors intend to provide privacy by encrypting the data outsourced to the cloud. But a strong encryption will make it difficult to search files.
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