The integration of advanced communication technologies with modern vehicular systems has driven the evolution of vehicular ad-hoc networks (VANETs). These networks enable a seamless exchange of road safety information between vehicles and traffic management authorities via wireless links. However, the open nature of these communication channels introduces significant risks to the privacy and security of transmitted messages. To address these challenges, Liet al. (IEEE Trans. Inf. Forensics and Security, vol. 19, pp. 9629–9642, 2024) proposed a lattice-based authentication scheme designed for fog-assisted VANETs. This protocol utilizes lattice cryptography to ensure resilience against quantum attacks and employs fog computing to tackle scalability issues. Despite these advancements, a detailed analysis uncovers several vulnerabilities and inefficiencies in their design. This study identifies an anonymity disclosure attack on Liet al.’s scheme, compromising its privacy guarantees. In addition, redundancies in the signature generation process impose excessive computational burdens on resource-constrained vehicular devices. To address these shortcomings, this work introduces a lattice-based anonymous batch-verifiable authentication (LBABVA) scheme. Rigorous security analysis proves the scheme’s security in the random oracle model, while efficiency evaluations reveal significant improvements. The proposed scheme reduces the computational cost of the signing phase to 14.57% and the signature verification phase to 83.99% of the corresponding costs of the previous design, highlighting its superior performance and suitability for practical applications.

ABSTRACT In this paper, we introduce a lattice‐based authenticated three‐party key agreement scheme for mobile devices with the aim of achieving both post‐quantum security and efficiency. Our scheme is inspired by the authenticated key exchange protocol developed. We revisit the recently suggested system, which is a communication‐efficient three‐party password‐authenticated key exchange, in which we found that the scheme is not fully correct and also demonstrate that the scheme is not safe from user's anonymity and impersonation assaults. We provide an enhanced scheme that is both effective and resistant to the mentioned assault. We also demonstrate its security in a ROM (Random Oracle Model). A comparison analysis that includes performance, security evaluations, energy consumption, and packet loss rate is also provided, proving the suitability of the suggested design.

The growing use of the Internet of Medical Things (IoMT) necessitates robust security and privacy mechanisms to protect sensitive patient data. In IoMT, conventional authentication techniques tend to be subject to security flaws. In this article, we propose an innovative, safe, and effective blockchain-based authentication scheme for secure communication in IoMT. The scheme utilizes the intrinsic properties of blockchain technology, such as immutability and decentralization in order to provide safe and reliable communication amongst IoMT devices. We present a comparative analysis of our scheme with existing schemes, emphasizing its benefits in terms of computation and communication costs. Finally, we put the proposed scheme into practice using the NS-3 simulator and run a number of thorough simulations to confirm its applicability and effectiveness in real-world situations.