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Data de-duplication is one of important data compression techniques for eliminating duplicate copies of repeating data, and has been widely used in cloud storage to reduce the amount of storage space and save bandwidth. To protect the confidentiality of sensitive data while supporting de-duplication, the convergent encryption technique can be used to encrypt the data before outsourcing. To better protect data security, this paper is attempting to make a survey for data security methods thatdoi:10.17148/iarjset.2017.4409 fatcat:r3nggf4stvfovf55egspjzmqte