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Erschienen in:
2011 | OriginalPaper | Buchkapitel
Towards Public Key Encryption Scheme Supporting Equality Test with Fine-Grained Authorization
verfasst von : Qiang Tang
Erschienen in: Information Security and Privacy
Verlag: Springer Berlin Heidelberg
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In this paper we investigate a new category of public key encryption schemes which supports equality test between ciphertexts. With this primitive, two users, who possess their own public/private key pairs, can issue token(s) to a proxy to authorize it to perform equality test between their ciphertexts. We provide a formulation and a corresponding construction for this primitive, and our formulation provides fine-grained authorization policy enforcements for users. With the increasing popularity of outsourcing data and computations to third-party service providers, this primitive will be an important building block in designing privacy protection solutions supporting operations on encrypted data.