HRFPRE: Fast Proxy Re-encryption for Multi-RSU Outsourcing and Hardware-assisted Revocation in the IoV.

Tingting Li; Leyou Zhang; Qing Wu; Fei Zhou; Yuxing Wei

Paper 2026/1789

HRFPRE: Fast Proxy Re-encryption for Multi-RSU Outsourcing and Hardware-assisted Revocation in the IoV.

Tingting Li

, Xidian University, Guangxi Zhuang Autonomous Region Information Center

Leyou Zhang

, Xidian University, Guangxi Zhuang Autonomous Region Information Center

Qing Wu, Xi’an University of Posts and Telecommunications

Fei Zhou

, Guangxi Zhuang Autonomous Region Information Center

Yuxing Wei

, Guangxi Zhuang Autonomous Region Information Center

Abstract

In the Internet of Vehicles (IoV), content-centric data sharing is essential for driving safety and user experience. However, the highly dynamic and distributed IoV network raises challenges such as unauthorized data access and inefficient information dissemination. Although existing proxy re-encryption (PRE) schemes with revocation partially mitigate these concerns, they still have key shortcomings: (i) computational costs that grow linearly with the number of attributes; (ii) heavy cloud-side overhead from re-encryption and outsourced decryption, causing delays or decryption failures; and (iii) revocation mechanisms that are inefficient or insufficiently responsive in handling malicious users. Recent studies have addressed these issues, but many schemes still struggle to ensure reliable message recovery in dynamic IoV scenarios. To overcome these limitations, we propose HRFPRE, an efficient proxy re-encryption mechanism based on multi-RSU outsourcing and hardware-assisted revocation. Our scheme provides constant-size public parameters and lightweight user-side decryption over asymmetric pairing-friendly groups, while supporting an unbounded attribute space. Re-encryption requires only four pairing operations and supports a novel "encrypt-then-offline hosting" model for vehicles. Simultaneously, Roadside Units (RSUs) provide outsourced re-encryption, key generation assistance, and decryption services to resource-constrained onboard units, effectively shifting computational load away from the cloud. By integrating a key-decoupled Trusted Execution Environment (TEE), HRFPRE enables immediate revocation and keeps plaintext recovery dependent on the user-held key even under TEE-side side-channel leakage. Under the Decisional Linear (DLIN) assumption, HRFPRE achieves adaptive security while resisting replay and collusion attacks. Theoretical analysis and experiments show that HRFPRE reduces computational and communication overhead, making it suitable for secure data exchange in dynamic IoV environments.

Note: This manuscript is submitted to the IACR ePrint Archive as a preprint and has not been published elsewhere.

Metadata

Available format(s): PDF
Category: Public-key cryptography
Publication info: Preprint.
Keywords: Internet of Vehicles (IoV)Attribute-based Proxy Re-encryption Revocation Security Data Sharing
Contact author(s): 18661501165 @ 163 com
History: 2026-08-26: approved; 2026-08-24: received; See all versions
Short URL: https://ia.cr/2026/1789
License: CC BY-NC-ND

BibTeX

@misc{cryptoeprint:2026/1789,
      author = {Tingting Li and Leyou Zhang and Qing Wu and Fei Zhou and Yuxing Wei},
      title = {{HRFPRE}: Fast Proxy Re-encryption for Multi-{RSU} Outsourcing and Hardware-assisted Revocation in the {IoV}.},
      howpublished = {Cryptology {ePrint} Archive, Paper 2026/1789},
      year = {2026},
      url = {https://eprint.iacr.org/2026/1789}
}