1. Multi-client Predicate-only Encryption for Conjunctive Equality Tests
- Author
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van de Kamp, Tim, Peter, Andreas, Everts, Maarten H., Jonker, Willem, Capkun, Srdjan, Chow, Sherman S.M., Services, Cybersecurity & Safety, and Digital Society Institute
- Subjects
Predicate-only encryption ,Theoretical computer science ,Computer science ,Network security ,Functional encryptions ,Cryptography ,02 engineering and technology ,Encryption ,Proof of concept ,Commodity hardware ,020204 information systems ,0202 electrical engineering, electronic engineering, information engineering ,Chosen-plaintext attack ,business.industry ,Multiple clients ,Multi-client functional encryption ,020206 networking & telecommunications ,Plaintext ,Bilinear groups ,Predicate (grammar) ,Privacy-preserving multi-client monitoring ,Privacy preserving ,business ,Encryption schemes - Abstract
We propose the first multi-client predicate-only encryption scheme capable of efficiently testing the equality of two encrypted vectors. Our construction can be used for the privacy-preserving monitoring of relations among multiple clients. Since both the clients’ data and the predicates are encrypted, our system is suitable for situations in which this information is considered sensitive. We prove our construction plaintext and predicate private in the generic bilinear group model using random oracles, and secure under chosen-plaintext attack with unbounded corruptions under the symmetric external Diffie–Hellman assumption. Additionally, we provide a proof-of-concept implementation that is capable of evaluating one thousand predicates defined over the inputs of ten clients in less than a minute on commodity hardware. © Springer Nature Switzerland AG 2018.
- Published
- 2017