Welcome to the resource topic for 2015/632
Title:
On the Impossibility of Virtual Black-Box Obfuscation in Idealized Models
Authors: Mohammad Mahmoody, Ameer Mohammed, Soheil Nematihaji
Abstract:The celebrated work of Barak et. al (Crypto’01) ruled out the possibility of virtual black-box (VBB) obfuscation for general circuits. The recent work of Canetti, Kalai, and Paneth (TCC’15) extended this impossibility to the random oracle model, assuming the existence of trapdoor permutations (TDPs). On the other hand, the works of Barak et. al (Crypto’14) and Brakerski and Rothblum (TCC’14) showed that general VBB obfuscation is indeed possible in idealized graded encoding models. The recent work of Pass and Shelat (Cryptology ePrint 2015/383) complemented this result by ruling out general VBB obfuscation in idealized graded encoding models that enable evaluation of constant-degree polynomials in finite fields. In this work, we extend the above two impossibility results for general VBB obfuscation in idealized models. In particular we prove the following two results both assuming the existence of trapdoor permutations: * There is no general VBB obfuscation in the generic group model of Shoup (Eurocrypt’97) for any abelien group. By applying our techniques to the setting of Pass and Shelat we extend their result to any (even non-commutative) finite ring. * There is no general VBB obfuscation in the random trapdoor permutation oracle model. Note that as opposed to the random oracle which is an idealized primitive for symmetric primitives, random trapdoor permutation is an idealized public-key primitive.
ePrint: https://eprint.iacr.org/2015/632
See all topics related to this paper.
Feel free to post resources that are related to this paper below.
Example resources include: implementations, explanation materials, talks, slides, links to previous discussions on other websites.
For more information, see the rules for Resource Topics .