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.
|Publication status||Published - 2017|
|Event||16th International Conference on Cryptology And Network Security 2017 - Hong Kong, China|
Duration: 29 Nov 2017 → 2 Dec 2017
Conference number: 16
|Conference||16th International Conference on Cryptology And Network Security 2017|
|Abbreviated title||CANS 2017|
|Period||29/11/17 → 2/12/17|