Cryptology ePrint Archive: Report 2019/264

Unifying computational entropies via Kullback-Leibler divergence

Rohit Agrawal and Yi-Hsiu Chen and Thibaut Horel and Salil Vadhan

Abstract: We introduce KL-hardness, a new notion of hardness for search problems which on the one hand is satisfied by all one-way functions and on the other hand implies both next-block pseudoentropy and inaccessible-entropy, two forms of computational entropy used in recent constructions of pseudorandom generators and statistically hiding commitment schemes, respectively. Thus, KL-hardness unifies the latter two notions of computational entropy and sheds light on the apparent "duality" between them. Additionally, it yields a more modular and illuminating proof that one-way functions imply next-block inaccessible entropy, similar in structure to the proof that one-way functions imply next-block pseudoentropy (Vadhan and Zheng, STOC '12).

Category / Keywords: foundations / one-way functions, pseudo-randomness, bit commitment, information theory, pseudoentropy, inaccessible entropy

Date: received 4 Mar 2019

Contact author: thorel at seas harvard edu

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Version: 20190306:030430 (All versions of this report)

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