Hybrid Scheme of Post-Quantum Cryptography and Elliptic-Curve Cryptography for Certificates -- A Case Study of Security Credential Management System in Vehicle-to-Everything Communications

• URL: http://arxiv.org/abs/2501.07028v1
• Date: Mon, 13 Jan 2025 02:59:59 GMT
• Title: Hybrid Scheme of Post-Quantum Cryptography and Elliptic-Curve Cryptography for Certificates -- A Case Study of Security Credential Management System in Vehicle-to-Everything Communications
• Authors: Abel C. H. Chen, Bon-Yeh Lin,
• Abstract summary: This study proposes a hybrid certificate scheme of PQC and ECC to overcome the challenges in V2X communication. PQC is used to establish a security level resistant to quantum computing attacks, while ECC is utilized to establish anonymous certificates.
• Score: 0.0
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• Abstract: Due to the current standard of Security Credential Management System (SCMS) for Vehicle-to-Everything (V2X) communications using asymmetric cryptography, specifically Elliptic-Curve Cryptography (ECC), which may be vulnerable to quantum computing attacks. Therefore, the V2X SCMS is threatened by quantum computing attacks. However, although the National Institute of Standards and Technology (NIST) has already selected Post-Quantum Cryptography (PQC) algorithms as the standard, the current PQC algorithms may have issues such as longer public key lengths, longer signature lengths, or lower signature generation and verification efficiency, which may not fully meet the requirements of V2X communication applications. In view of the challenges in V2X communication, such as packet length, signature generation and verification efficiency, security level, and vehicle privacy, this study proposes a hybrid certificate scheme of PQC and ECC. By leveraging the strengths of both PQC and ECC, this scheme aims to overcome the challenges in V2X communication. PQC is used to establish a security level resistant to quantum computing attacks, while ECC is utilized to establish anonymous certificates and reduce packet length to meet the requirements of V2X communication. In the practical experiments, the study implemented the SCMS end entity based on the Chunghwa Telecom SCMS and the Clientron On-Board Unit (OBU) to conduct field tests in Danhai New Town in New Taipei City. The performance of various existing hybrid certificate schemes combining PQC (e.g., Dilithium, Falcon, and SPHINCS+) and ECC is compared, and a practical solution is provided for V2X industries.

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