Title:	The Complexity of Collision-Resistant Hashing
Authors:	Pass, Rafael Tseng, Wei-Lung Dustin Venkitasubramaniam, Muthuramakrishnan
Issue Date:	24-Oct-2009
Abstract:	A long-standing open problem on the intersection of Complexity Theory and Cryptography is whether the security of cryptographic primitives can be based on the worst-case hardness of NP. We show that, unless coNP $\subseteq$ AM, collision-resistant hash functions---one of the most central cryptographic primitives---cannot be based on the worst-case hardness of NP using any randomized Turing reduction; previously such separations were established only for restricted (e.g. non-adaptive) types of reductions. Under an average-case strengthening of the assumption that coNP $\not\subseteq$ AM, we furthermore rule out generic---but potentially non-black-box---constructions of collision-resistant hash functions from one-way functions (using Turing reductions); as far as we know, this yields the first non-black-box separation between cryptographic primitives.
Description:	Item removed from eCommons on 2010-02-21 at the request of the author.
URI:	http://hdl.handle.net/1813/14136
Appears in Collections:	Computing and Information Science Technical Reports

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