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Paper: ABE for DFA from LWE against Bounded Collusions, Revisited

Authors:
Hoeteck Wee
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DOI: 10.1007/978-3-030-90453-1_10
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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 O~(L + B) for attributes of length L and collusion size B. Prior LWE-based schemes has either larger ciphertext size O~(L 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.
BibTeX
@article{tcc-2021-31537,
  title={ABE for DFA from LWE against Bounded Collusions, Revisited},
  booktitle={Theory of Cryptography;19th International Conference},
  publisher={Springer},
  doi={10.1007/978-3-030-90453-1_10},
  author={Hoeteck Wee},
  year=2021
}