arXiv:2611.11701 · v1

Using the Planted Clique Conjecture for Cryptography: Public-Key Encryption from Planted Clique and Noisy $k$-$\mathsf{LIN}$ Over Expanders

首次提交 2026-11-09 07:53

版本更新 2026-11-09 07:53

雷达观测 2026-11-10 13:19

摘要

We give a public key encryption scheme that is provably secure against poly-size adversaries, assuming $n^{\log^αn}$ hardness of the standard planted clique conjecture, for any $α\in (0,1)$, and a relatively mild hardness conjecture about noisy $k\mbox{-}\mathsf{LIN}$ over expanders that is not known to imply public-key encryption on its own. Both of our conjectures correspond to natural average-case variants of NP-complete problems and have been studied for multiple decades, with unconditional lower bounds supporting them in a variety of restricted models of computation. Our encryption scheme answers an open question in a seminal work by Applebaum, Barak, and Wigderson [STOC'10].