Incompressibility and Next-Block Pseudoentropy

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• Noam Mazor (Tel-Aviv University)
• Tuesday 21 May 2024, 11:00-12:00
• Computer Laboratory, William Gates Building, Room FS07.

If you have a question about this talk, please contact Tom Gur.

Abstract: A distribution is k-incompressible, Yao [FOCS ’82], if no efficient compression scheme compresses it to less than k bits. While being a natural measure, its relation to other computational analogs of entropy such as pseudoentropy (Hastad, Impagliazzo, Levin, and Luby [SICOMP 99]), and to other cryptographic hardness assumptions, was unclear.

We advance towards a better understating of this notion, showing that a k-incompressible distribution has (k-2) bits of next-block pseudoentropy, a refinement of pseudoentropy introduced by Haitner, Reingold, and Vadhan [SICOMP ’13]. We deduce that a samplable distribution X that is (H(X) + 2)-incompressible, implies the existence of one-way functions.

Joint work with Iftach Haitner and Jad Silbak.

This talk is part of the Algorithms and Complexity Seminar series.

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