An Efficient Key Expansion Method Applied to Security Credential Management System
Abstract
In recent years, U.S. Department of Transportation has adopts Institute of Electrical and Electronics Engineers (IEEE) 1609 series to build the security credential management system (SCMS) for being the standard of connected cars in U.S. Furthermore, a butterfly key expansion (BKE) method in SCMS has been designed to provide pseudonym certificates for improving the privacy of connected cars. However, the BKE method is designed based on elliptic curve cryptography (ECC) in the standard of IEEE 1609.2.1, but more execution time is required for key expansion. Therefore, this study proposes an original efficient key expansion method, and the mathematical principles have been proposed to prove the encryption/decryption feasibility, car privacy, and method efficiency. In a practical environment, the proposed method improves the efficiency of key expansion method in IEEE 1609.2.1-2022 with the same security strength thousands of times.
Keywords
Cite
@article{arxiv.2501.05627,
title = {An Efficient Key Expansion Method Applied to Security Credential Management System},
author = {Abel C. H. Chen},
journal= {arXiv preprint arXiv:2501.05627},
year = {2025}
}
Comments
The manuscript was submitted to arXiv on 27 November 2023, but it was rejected on 2 December 2023. The appeal was submitted on 18 September 2024, and it was accepted on 9 January 2025. The manuscript is written in Chinese language