Implementation of a privacy preserving index for search access controlled healthcare providers’ network

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has title::Implementation of a privacy preserving index for search access controlled healthcare providers’ network
status: finished
Master: project within::Internet and Web Technology
Student name: student name::Vu Thanh Tung
Dates
Start start date:=2012/02/01
End end date:=2012/07/31
Supervision
Supervisor: Herbert Bos
Second reader: has second reader::Thilo Kielmann
Company: has company::Georgia Institue of Technology
Thesis: has thesis::Media:Thesis.pdf
Poster: has poster::Media:Posternaam.pdf

Signature supervisor



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Abstract

The project aims to provide a privacy preserving index for search access controlled healthcare providers’ network. It addresses two goals at the same time: supporting efficient search over distributed, access controlled healthcare documents while also enabling guaranteed protection of content privacy (i.e. the search should not reveal the specific association between contents and providers). The project will develop a system based on the concept of role-sensitive Privacy Preserving Index (SS-PPI) (i.e. given a query in conjunction with the role of the querier, our role-sensitive PPI returns the groups of providers that potentially hold the content that matches the search term for this role).

The framework of SS-PPI mainly consists of two phases: index construction and query answering. The former, which is the main focus of the project, further processes in three major components: group formation, group aggregation and global index construction.

a, Group formation. SS-PPI organizes content providers into privacy groups, the project adopt the strategy of random grouping based on universal hashing.

b, Group aggregation. A summarization within each privacy group is built in a privacy-preserving manner that indexes the content possession by group members. SS-PPI constructs this aggregation by an extended secrete sharing scheme, which achieves both scalability and attack-resilience.

c, Privacy-aware global index construction. The global index is constructed efficiently by merging the set of group aggregations. SS-PPI adopts a distributed scheme that not only amortizes the trust on a single third party, but also supports localized, incremental index update.