International Association for Cryptologic Research

International Association
for Cryptologic Research

IACR News item: 16 July 2015

Mihir Bellare, Igors Stepanovs
ePrint Report ePrint Report
We unify the many prior variants of point-function obfuscation via a definitional framework in which security is parameterized by a class of algorithms we call target generators, with different notions corresponding to different choices of this class. This leads to an elegant question, namely whether it is 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 a host of new point-function obfuscators, including many under standard assumptions.

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