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Title:
A Generic Construction of CCA-secure Attribute-based Encryption with Equality Test
Authors: Kyoichi Asano, Keita Emura, Atsushi Takayasu, Yohei Watanabe
Abstract:Attribute-based encryption with equality test (\mathsf{ABEET}) is an extension of the ordinary attribute-based encryption (\mathsf{ABE}), where trapdoors enable us to check whether two ciphertexts are encryptions of the same message. Thus far, several CCA-secure \mathsf{ABEET} schemes have been proposed for monotone span programs satisfying selective security under q-type assumptions. In this paper, we propose a generic construction of CCA-secure \mathsf{ABEET} from delegatable \mathsf{ABE}. Specifically, our construction is an attribute-based extension of Lee et al.'s generic construction of identity-based encryption with equality test from hierarchical identity-based encryption. Even as far as we know, there are various delegatable \mathsf{ABE} schemes. Therefore, we obtain various \mathsf{ABEET} schemes with new properties that have not been achieved before such as various predicates, adaptive security, standard assumptions, compact ciphertexts/secret keys, and lattice-based constructions.
ePrint: https://eprint.iacr.org/2021/1371
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