[Resource Topic] 2024/420: Gap MCSP is not (Levin) NP-complete in Obfustopia

Welcome to the resource topic for 2024/420

Title:
Gap MCSP is not (Levin) NP-complete in Obfustopia

Authors: Noam Mazor, Rafael Pass

Abstract:

We demonstrate that under believable cryptographic hardness assumptions, Gap versions of standard meta-complexity problems, such as the Minimum Circuit Size problem (MCSP) and the Minimum Time-Bounded Kolmogorov Complexity problem (MKTP) are not NP-complete w.r.t. Levin (i.e., witness-preserving many-to-one) reductions.

In more detail:

  • Assuming the existence of indistinguishability obfuscation, and subexponentially-secure one-way functions, an appropriate Gap version of MCSP is not NP-complete under randomized Levin-reductions.
  • Assuming the existence of subexponentially-secure indistinguishability obfuscation, subexponentially-secure one-way functions and injective PRGs, an appropriate Gap version of MKTP is not NP-complete under randomized Levin-reductions.

ePrint: https://eprint.iacr.org/2024/420

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