Efficient Multi-Authority Attribute Based Encryption From Lattices

Xingting Dong, Yongzhuang Wei, Shanshan Zhang and Minghe Zhang
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Xingting Dong: Guangxi Key Laboratory of Trusted Software, China
Yongzhuang Wei: Guangxi Key Laboratory of Cryptography and Information Security, China
Shanshan Zhang: Independent Researcher, China
Minghe Zhang: Guangxi Key Laboratory of Cryptography and Information Security, China

International Journal of Information Security and Privacy (IJISP), 2026, vol. 20, issue 1, 1-20

Abstract: Multi-authority attribute-based encryption (MA-ABE) is a generalization of ABE where each party can become an authority. In TCC 2022, Waters et al. constructed an MA-ABE scheme for the class of subset policies from related-trapdoor LWE. However, their security reduction imposes significant overhead on the security and efficiency of their scheme. In this paper, the authors propose some improvements to this MA-ABE scheme. Firstly, they optimize the size of the public key and simplify the security proof to make the security reduction more compact. To further improve the encryption efficiency, they construct a new scheme over rings and reduce it directly to ring LWE. To generate a user's secret key in our scheme, they extend the Gaussian sampling algorithm over ideal lattices. Finally, they streamline the statement and proof of the Leftover Hash Lemma over rings to make the security proof of our MA-ABE scheme more concise.

Date: 2026
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