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Point-Function Obfuscation: A Framework and Generic Constructions

2015; Springer Science+Business Media; Linguagem: Inglês

10.1007/978-3-662-49099-0_21

1611-3349

Mihir Bellare, Igors Stepanovs,

Chaos-based Image/Signal Encryption

We give a definitional framework for point-function obfuscation in which security is parameterized by a class of algorithms we call target generators. Existing and new notions are captured and explained as corresponding to different choices of this class. This leads to an elegant question: Is it possible to provide a generic construction, meaning one that takes an arbitrary class of target generators and returns a point-function obfuscator secure for it? We answer this in the affirmative with three generic constructions, the first based on indistinguishability obfuscation, the second on deterministic public-key encryption and the third on universal computational extractors. By exploiting known constructions of the primitives assumed, we obtain new point-function obfuscators, including many under standard assumptions. We end with a broader look that relates different known and possible notions of point function obfuscation to each other and to ours.