An Efficient Key Expansion Method Applied to Security Credential Management System

• URL: http://arxiv.org/abs/2501.05627v1
• Date: Thu, 09 Jan 2025 23:59:46 GMT
• Title: An Efficient Key Expansion Method Applied to Security Credential Management System
• Authors: Abel C. H. Chen,
• Abstract summary: U.S. Department of Transportation has adopts IEEE 1609 series to build the security credential management system (SCMS) for being the standard of connected cars in U.S. A butterfly key expansion (BKE) method in SCMS has been designed to provide certificates for improving the privacy of connected cars. 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.
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• 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.

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