Cryptology ePrint Archive: Report 2008/129

Controlling access to personal data through Accredited Symmetrically Private Information Retrieval

Mohamed Layouni

Abstract: With the digitization of society and the continuous migration of services to the electronic world, individuals have lost significant control over their data. In this paper, we consider the problem of protecting personal information according to privacy policies defined by the data subjects. More specifically, we propose a new primitive allowing a data subject to decide when, how, and by whom his data can be accessed, without the database manager learning anything about his identity, at the time the data is retrieved. The proposed solution, which we call Accredited SPIR, combines symmetrically private information retrieval and privacy-preserving digital credentials. We present three constructions based on the discrete logarithm and RSA problems. Despite the added privacy safeguards, the extra cost incurred by our constructions is negligeable compared to that of the underlying building blocks.

Category / Keywords: cryptographic protocols / Symmetrically private information retrieval, anonymous credentials, policy enforcement.

Publication Info: A shorter version has appeared in the proceedings of the 2nd International Workshop on Security, IWSEC 2007

Date: received 23 Mar 2008, last revised 23 Mar 2008

Contact author: mlayou at cs mcgill ca

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Version: 20080325:121958 (All versions of this report)

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