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As Web services become more prevalent, more and more sensitive information are being centralized in the web. Usually lots of sensitive information is stored in the web. To provide data privacy data has to be encrypted before outsourcing. Traditional searchable schemes also allow a user to search the encrypted data securely in the web through keywords and retrieve files of interest, but these techniques only allows exact keyword search. They don't retrieve the files which are having minor differences or inconsistencies in the keyword positions.
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