Journal of Xidian University

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Provable multi-copy dynamic data possession in cloud storage

REN Jingsi1,2;WANG Jinlin1;CHEN Xiao1;YE Xiaozhou1   

  1. (1. National Network New Media Engineering Research Center, Institute of Acoustics, Chinese Academy of Sciences, Beijing  100190, China;
    2. University of Chinese Academy of Sciences, Beijing  100049, China)
  • Received:2016-11-24 Online:2017-12-20 Published:2018-01-18

Abstract:

In the cloud storage paradigm, verifying the integrity of multiple remote copies is inefficient, and dynamic data updates are not supported. To solve this problem, we first propose a multi-copy integrity checking model for the distributed cloud storage system, and then design a multi-copy provable data possession scheme based on the bilinear map and pseudo-random mask technique. Aiming at updating multiple copies, each data block is mapped to an entry in the seed mapping table. Security analysis and performance evaluation show that our scheme is correct and complete, and can significantly improve efficiency.

Key words: cloud storage, cloud security, multiple copies, dynamic data, possession proving


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