Shared Authority Based Privacy-Preserving Authentication Protocol in Cloud Computing - 2015
Cloud computing is an emerging knowledge interactive paradigm to appreciate users' information remotely stored in an on-line cloud server. Cloud services offer nice conveniences for the users to fancy the on-demand cloud applications without considering the local infrastructure limitations. Throughout the information accessing, different users may be in a collaborative relationship, and thus information sharing becomes vital to attain productive edges. The existing security solutions mainly focus on the authentication to realize that a user's privative data can not be illegally accessed, however neglect a delicate privacy issue during a user difficult the cloud server to request other users for knowledge sharing. The challenged access request itself could reveal the user's privacy no matter whether or not it can obtain the data access permissions. In this paper, we propose a shared authority based mostly privacy-preserving authentication protocol (SAPA) to address higher than privacy issue for cloud storage. In the SAPA, one) shared access authority is achieved by anonymous access request matching mechanism with security and privacy concerns (e.g., authentication, information anonymity, user privacy, and forward security); 2) attribute based mostly access control is adopted to appreciate that the user will only access its own information fields; 3) proxy re-encryption is applied to produce knowledge 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 is enticing for multi-user collaborative cloud applications.
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