Attribute-Based Encryption (ABE) is a cryptographic primitive which supports fine-grained access control on encrypted data, making it an appealing building block for many applications. Multi-Authority Attribute-Based Encryption (MA-ABE) is a generalization of ABE where the central authority is distributed across several independent parties. We provide the first MA-ABE scheme from asymmetric prime-order pairings where no trusted setup is needed and where the attribute universe of each authority is unbounded. Moreover, it is the first to handle non-monotonic access structures. These features broaden the applicability and improve the efficiency of our scheme. Our construction makes a modular use of Functional Encryption schemes with fine-grained access control.
CITATION STYLE
Ambrona, M., & Gay, R. (2023). Multi-authority ABE for Non-monotonic Access Structures. In Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) (Vol. 13941 LNCS, pp. 306–335). Springer Science and Business Media Deutschland GmbH. https://doi.org/10.1007/978-3-031-31371-4_11
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