Title: Ciphertext-policy attribute-based delay encryption

Authors: Lijiao Chen; Kewei Lv

Addresses: State Key Laboratory of Information Security, Institute of Information Engineering, Chinese Academy of Sciences, Beijing, 100093, China; State Key Laboratory of Cryptology, P.O. Box 5159, Beijing 100878, China; School of Cyber Security, University of Chinese Academy of Sciences, Beijing, 100049, China; Data Assurance and Communication Security Research Center, Chinese Academy of Sciences, Beijing, 100093, China ' State Key Laboratory of Information Security, Institute of Information Engineering, Chinese Academy of Sciences, Beijing, 100093, China; State Key Laboratory of Cryptology, P.O. Box 5159, Beijing 100878, China; School of Cyber Security, University of Chinese Academy of Sciences, Beijing, 100049, China; Data Assurance and Communication Security Research Center, Chinese Academy of Sciences, Beijing, 100093, China

Abstract: Timed-release CP-ABE can provide fine-grained and timed-release access control while ensuring data confidentiality. Existing schemes usually rely on a trusted third-party called time server. This paper proposes a novel timed-release CP-ABE scheme named ciphertext-policy attribute-based delay encryption (CP-ABDE), which does not require a time server. Specifically, we formalise the notion of CP-ABDE and its system model and security model. Furthermore, we provide a formal construction that is secure under the decisional bilinear Diffie-Hellman assumption and repeated squaring assumption. Finally, performance analysis shows that the scheme performs well while achieving timed-release access control.

Keywords: ciphertext-policy attribute-based encryption; CP-ABE; time-lock puzzle; TLP; access control; timed-release; delay.

DOI: 10.1504/IJICS.2023.134960

International Journal of Information and Computer Security, 2023 Vol.22 No.2, pp.167 - 185

Received: 06 Nov 2021
Accepted: 08 Feb 2022
Published online: 22 Nov 2023 *

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