Abstract
With the advent of cloud storage, users can share their own data in the remote cloud as a group. To ensure the security of stored data and the normal operation of public auditing, once a user is revoked from the user group, the data files he signed should be resigned by other legal users in the group. In this paper, we propose a new re-signature scheme utilizing backup files to rebuild data which can resist the collusion between the cloud and revoked users, and we use Shamir Secret Sharing Scheme to encrypt data in the multi-managers system which can separate the authority of the group managers. Moreover, our scheme is more practical because we do not need managers to be online all the time. Performance evaluation shows that our mechanism can improve the efficiency of the process of data re-signature.
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Foundation item: Supported by the National Natural Science Foundation of China (61572390), the National Key Research and Development Program of China (2017YFB0802000), the National Natural Science Foundation of Ningbo City (201601HJ-B01382), and the Open Foundation of Key Laboratory of Cognitive Radio and Information Processing of Ministry of Education (Guilin University of Electronic Technology) (CRKL160202)
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Liu, H., Wang, B., Lu, K. et al. Public Auditing for Shared Data Utilizing Backups with User Revocation in the Cloud. Wuhan Univ. J. Nat. Sci. 23, 129–138 (2018). https://doi.org/10.1007/s11859-018-1303-4
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DOI: https://doi.org/10.1007/s11859-018-1303-4