Re-formulating Metadata for Privacy-aware Access Control in Information Sharing

Liu Yimin; Wang Zhihui; Wang Wei; Li Qiuhong

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Re-formulating Metadata for Privacy-aware Access Control in Information Sharing

Liu Yimin 1,Wang Zhihui 2 *, Wang Wei 3, Li Qiuhong 3

1.School of Computer Science, Fudan University, Shanghai 200433；Information Department of the 3rd Affiliated Hospital, the 2nd Military Medical University, ShangHai 200438

2.School of Computer Science, Fudan University, Shanghai 200433

3. School of Computer Science, Fudan University, Shanghai 200433

*Correspondence author

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Funding: 高等学校博士学科点专项科研基金（No.200802461146 ）

Opened online:23 February 2012

Accepted by: none

Citation: Liu Yimin,Wang Zhihui, Wang Wei.Re-formulating Metadata for Privacy-aware Access Control in Information Sharing[OL]. [23 February 2012] http://en.paper.edu.cn/en_releasepaper/content/4464890

With the extensive use of XML technology in data transmission and sharing, access control for sensitive and private XML data becomes one of the urgent problems. This paper has proposed an approach based on the minimum secure access tree, which reconstructs the purpose-based metadata model and thus effectively implements privacy-aware data access control. In the approach, the metadata model of purpose is a purpose-based secure access trees, which can be further broken to a group of path expression of xpath {/,//,[ ]} fragments pointing to a set of privacy nodes in the tree. By removing the redundant paths and reducing the number of data nodes, this paper can describe the purpose-based access control policy with the minimum secure access tree. Based on the idea of the xpath fragments query containing, this paper has furthermore presented the algorithms for generating purpose-based minimum secure access tree and implementing privacy-aware data access control mechanism for XML data. The experimental results show that the approach can prevent well the leakage of private XML data, and the query time mainly depends on the structural complexity of query xpath {/,//,[ ]} and the number of nodes on the query path.

Keywords:Database; Privacy Preservation; Information Sharing; Minimum Secure Access Tree

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