In our model, privacy is accomplished by encrypting the data it can prevent the un authorized access. We are going to raise the privacy level of the data owner and the confidentiality of the data by providing access to users. Here we proposed the secured system and data owner can decide whether the user can access the system or not. In this paper, we propose a shared authority based privacy-preserving authentication protocol (SAPA) to address some privacy issue for cloud storage. In the SAPA, 1) shared access authority is achieved by anonymous access request matching mechanism with security and privacy considerations (e.g., authentication, data anonymity, user privacy, and forward security); 2) attribute based access control is adopted to realize that the user can only access its own data fields; 3) proxy re-encryption is applied by the cloud server to provide data sharing among the multiple users. Meanwhile, universal composability (UC) model is established to prove that the SAPA theoretically has the design correctness. It indicates that the proposed protocol realizing privacy-preserving data access authority sharing, is attractive for multi-user collaborative cloud applications.
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