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IACR
2016

Better Security for Functional Encryption for Inner Product Evaluations

5 years 6 months ago
Better Security for Functional Encryption for Inner Product Evaluations
Functional encryption is a new public key paradigm that solves, in a non-interactive way, most of the security challenges raised by cloud computing. A recent paper by Abdalla, Bourse, De Caro, and Pointcheval shows a functional encryption scheme for evaluations of inner products whose security can be proven under simple assumptions. Inner product evaluation is a simple, but quite powerful functionality, that suffices for many concrete applications. We analyze the different security notions for functional encryption for inner product evaluation and propose a new generic construction that achieves security against adaptive adversaries. We show 3 instantiations based on the ElGamal encryption (plain DDH assumption), Paillier/BCP encryption (DCR assumption), and Regev encryption (LWE assumption). All of them have different advantages and drawbacks, but with acceptable trade-offs, and rely on standard assumptions.
Michel Abdalla, Florian Bourse, Angelo De Caro, Da
Added 03 Apr 2016
Updated 03 Apr 2016
Type Journal
Year 2016
Where IACR
Authors Michel Abdalla, Florian Bourse, Angelo De Caro, David Pointcheval
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