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The main purpose of this paper is to share the data on cloud. In this paper, we present that how to share data securely, reliably, and flexibly on cloud storage and how to manage their integrity while sharing on cloud. By using group signature and dynamic broadcast encryption techniques, any cloud user can anonymously share data with others. To conserve data privacy, the main solution is to encrypt data files, then upload the encrypted data into the cloud. In Secure Sharing of Data for Dynamic Multi Owner in we design a secure data sharing scheme for dynamic group of company in an untrusted cloud.
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