## CryptoDB

### Paper: Optimal Broadcast Encryption and CP-ABE from Evasive Lattice Assumptions

Authors: Hoeteck Wee , NTT Research Search ePrint Search Google Slides EUROCRYPT 2022 We present a new, simple candidate broadcast encryption scheme for N users with parameter size poly(logN). We prove security of our scheme under a non-standard variant of the LWE assumption where the distinguisher additionally receives short Gaussian pre-images while avoiding zeroizing attacks. This yields the first candidate optimal broadcast encryption that is plausibly post-quantum secure, and enjoys a security reduction to a simple assumption. As a secondary contribution, we present a candidate ciphertext-policy attribute-based encryption (CP-ABE) scheme for circuits of a-priori bounded polynomial depth where the parameter size is independent of the circuit size, and prove security under an additional non-standard assumption.
##### BibTeX
@inproceedings{eurocrypt-2022-31969,
title={Optimal Broadcast Encryption and CP-ABE from Evasive Lattice Assumptions},
publisher={Springer-Verlag},
author={Hoeteck Wee},
year=2022
}