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Title:
ABE for DFA from LWE against Bounded Collusions, Revisited
Authors: Hoeteck Wee
Abstract:We present a new public-key ABE for DFA based on the LWE assumption, achieving security against collusions of a-priori bounded size. Our scheme achieves ciphertext size \tilde{O}(\ell + B) for attributes of length \ell and collusion size B. Prior LWE-based schemes has either larger ciphertext size \tilde{O}(\ell \cdot B), or are limited to the secret-key setting. Along the way, we introduce a new technique for lattice trapdoor sampling, which we believe would be of independent interest. Finally, we present a simple candidate public-key ABE for DFA for the unbounded collusion setting.
ePrint: https://eprint.iacr.org/2022/1348
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