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- Title
Cryptanalysis of Two Conditional Privacy Preserving Authentication Schemes for Vehicular Ad Hoc Networks.
- Authors
Kabil, Ahmad Mohamad; Aslan, Heba; Azer, Marianne
- Abstract
Conditional Privacy Preserving Authentication (CPPA) schemes are an effective way of securing communications in vehicular ad hoc networks (VANETs), as well as ensuring user privacy and accountability. Cryptanalysis plays a crucial role in pointing out the vulnerabilities in existing schemes to enable the development of more resilient ones. In 2019, Zhang proposed a CPPA scheme for VANET security (PA-CRT), based on identity batch verification (IBV) and Chinese Remainder Theorem (CRT). In this paper, we cryptanalyze Zhang's scheme and point out its vulnerability to impersonation and repudiation attacks. In 2023, Zhang's scheme was cryptanalyzed by Tao; however, we point out flaws in Tao's cryptanalysis due to invalid assumptions; hence, we propose countermeasures to Tao's attacks. Furthermore, in 2021, Xiong proposed a Certificateless Aggregate Signature (CLAS) scheme which is also cryptanalyzed in this paper. Finally, we analyze the causes and countermeasures by pointing out the vulnerabilities in each scheme that enabled us to launch successful attacks and proposing changes that would fortify these schemes against similar attacks in the future.
- Subjects
VEHICULAR ad hoc networks; PUBLIC key cryptography; CHINESE remainder theorem; CRYPTOGRAPHY; PRIVACY
- Publication
Cryptography (2410-387X), 2024, Vol 8, Issue 1, p4
- ISSN
2410-387X
- Publication type
Article
- DOI
10.3390/cryptography8010004