Welcome to the resource topic for 2015/627
Title:
On Necessary Padding with IO
Authors: Justin Holmgren
Abstract:We show that the common proof technique of padding a circuit before IO obfuscation is sometimes necessary. That is, assuming indistinguishability obfuscation (IO) and one-way functions exist, we define samplers Sam_0, which outputs (aux_0, C_0), and Sam_1, which outputs (aux_1, C_1) such that: - The distributions (aux_0, iO(C_0)) and (aux_1, iO(C_1)) are perfectly distinguishable. - For padding s = poly(lambda)$, the distributions (aux_0, iO(C_0||0^s)) and (aux_1, iO(C_1||0^s)) are computationally indistinguishable. We note this refutes the recent “Superfluous Padding Assumption” of Brzuska and Mittelbach.
ePrint: https://eprint.iacr.org/2015/627
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