Netinfo Security ›› 2015, Vol. 15 ›› Issue (12): 1-7.doi: 10.3969/j.issn.1671-1122.2015.12.001

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A Dynamic Cloud Data Audit Scheme Based on Update Tree

ZHAO Yang, REN Huaqiang(), XIONG Hu, CHEN Yang   

  1. School of Information and Software Engineering, University of Electronic Science and Technology of China, Chengdu Sichuan 610054, China
  • Received:2015-07-28 Online:2015-12-20 Published:2016-01-04

Abstract:

The cloud server is partially trusted. In order to ensure the completeness and correctness of the cloud data, users need to periodically audit the cloud data. At the same time the cloud server should also support user to update the cloud data dynamic. The provable dynamic cloud data possession scheme via update tree came up with a new update tree structure which is used to realize dynamic data integrity audit plan. The update trees exist a version number of data blocks, the range of serial number, the offset, the setting of range makes the trees don’t have to use a node to store the attribute of a single block of data. The continuous serial number with same version and offset can be stored in a node to the update tree, and it greatly reduces the storage space and access time. In the dynamic audit process, the system can be according to the serial number and offset to determine the data block number in signature for validation. At the same time when the user updates the data blocks for a range, it only needs to update the tree node which the range in it. When the update tree is not balance, it can be adjusted according to the principle of balanced binary tree. The update tree node stores attributes for a range of data blocks, and this characteristic makes the size of the tree affected by the times of dynamic operations not by the file size, and thus the performance of the audit will not step down when the file size become large. By the security and performance analysis which in the end of this article, we can be seen that this scheme is an efficient security provable dynamic cloud data possession scheme.

Key words: cloud storage security, dynamic cloud data audit, update tree

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