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Time-controlled proxy searchable re-encryption against collusion attacks.

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Title: Time-controlled proxy searchable re-encryption against collusion attacks.
Authors: Zhang, Hui1 (AUTHOR) zhanghui18@cdut.edu.cn, Fu, Junjun2 (AUTHOR), Liao, Xiaojuan1,3 (AUTHOR), Chen, Guangzhu1,3 (AUTHOR), Ma, Haichuan1,3 (AUTHOR), Zhou, Rang1 (AUTHOR)
Source: Computer Standards & Interfaces. Apr2026, Vol. 97, pN.PAG-N.PAG. 1p.
Subjects: Collusion, Data encryption, Electronic health records, Keyword searching, Access control, Cloud computing security measures
Abstract: Proxy Re-Encryption with Keyword Search (PREKS) enables the secure delegation of search authority over encrypted data, which is highly valuable in scenarios such as electronic health systems: patients (data owners) upload encrypted Electronic Health Data (EHD) and keywords to the cloud, granting initial search permissions to attending doctors (delegators); delegators can share these permissions with consulting doctors (delegatees) by re-encrypting keywords via a proxy server, without the need to consult data owners again. Existing PREKS schemes require a trusted proxy to avoid collusion risks between the proxy and delegatees, resulting in high communication overhead. To address this issue, this paper proposes a Time-controlled public key Proxy Searchable Re-Encryption scheme against Collusion Attacks (TcPSRE-CA), which innovatively integrates proxy functionality with cloud servers to reduce overhead. The scheme supports time-limited authorization and conjunctive keyword search, with its security proven under the random oracle model. Experimental results demonstrate that the proposed scheme effectively reduces communication and storage overhead while maintaining high computational efficiency. [Display omitted] • A time-controlled proxy searchable re-encryption scheme (TcPSRE-CA) is proposed. • TcPSRE-CA integrates proxy and cloud functionalities to reduce communication overhead. • TcPSRE-CA supports conjunctive keyword search while ensuring query privacy. • TcPSRE-CA effectively resists collusion between the proxy server and delegatee. • Formal security is proven under the standard random oracle model. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Proxy Re-Encryption with Keyword Search (PREKS) enables the secure delegation of search authority over encrypted data, which is highly valuable in scenarios such as electronic health systems: patients (data owners) upload encrypted Electronic Health Data (EHD) and keywords to the cloud, granting initial search permissions to attending doctors (delegators); delegators can share these permissions with consulting doctors (delegatees) by re-encrypting keywords via a proxy server, without the need to consult data owners again. Existing PREKS schemes require a trusted proxy to avoid collusion risks between the proxy and delegatees, resulting in high communication overhead. To address this issue, this paper proposes a Time-controlled public key Proxy Searchable Re-Encryption scheme against Collusion Attacks (TcPSRE-CA), which innovatively integrates proxy functionality with cloud servers to reduce overhead. The scheme supports time-limited authorization and conjunctive keyword search, with its security proven under the random oracle model. Experimental results demonstrate that the proposed scheme effectively reduces communication and storage overhead while maintaining high computational efficiency. [Display omitted] • A time-controlled proxy searchable re-encryption scheme (TcPSRE-CA) is proposed. • TcPSRE-CA integrates proxy and cloud functionalities to reduce communication overhead. • TcPSRE-CA supports conjunctive keyword search while ensuring query privacy. • TcPSRE-CA effectively resists collusion between the proxy server and delegatee. • Formal security is proven under the standard random oracle model. [ABSTRACT FROM AUTHOR]
ISSN:09205489
DOI:10.1016/j.csi.2026.104139