Practical SM2-Based Multisignature Scheme with Applications to Vehicular Networks

Lin Hou,Wei Liu,Guo-Qiang Zeng,Lisha Yao,Xiaojian Liang,Rongmao Chen

doi:10.1155/2021/7897527

Abstract

In vehicular networks, the increasing value of transportation data and scale of connectivity also brings many security and privacy concerns. Peer authentication and message integrity are two vital security requirements to ensure safe transportation system. Because of the constrained resources of the units performing the cryptographic components, the proposed security-enhancing schemes should be lightweight and scalable. In this paper, we present a multisignature scheme derived from the SM2 signature which enables a group of parties to collaboratively sign a message and generate a compact joint signature at the end. Our scheme requires no preprocessing or interactions among the parties before signing, and its performance matches or surpasses known ones in terms of signing time, verification time, and signature size. Therefore, our scheme is also suitable for vehicular networks, with the goal to enhance security with small computation and storage cost.

Highlights

With the development of advanced information and communication-based technologies, intelligent transportation system (ITS) can provide a seamless transportation infrastructure and more functionalities for vehicles than a decade ago
The Vehicle-to-Everything (V2X) communication technology in vehicular networks nowadays is able to support information sharing between vehicles and any other element involved in ITS [1, 2], including nearby vehicles (V2V), the infrastructure (V2I), mobile devices carried by pedestrians (V2P), and remote application servers or cloud platforms (V2N). e increasing scale of ITS ecosystem and the growing trend to integrate vehicular network deployment with other networks bring concerns about cybersecurity for ITS since any message interception or modification by malicious units could result in fatal consequences [3, 4]
We propose a candidate multisignature scheme MS − SM2 based on the SM2 signature algorithm and specify the applications of MS − SM2 for vehicular networks

Summary

Introduction

With the development of advanced information and communication-based technologies, intelligent transportation system (ITS) can provide a seamless transportation infrastructure and more functionalities for vehicles than a decade ago. As in the traditional signature scheme, the short combined signature should convince the verifier that all signers signed their designated messages. Both MS and AS schemes have many potential uses in vehicular networks, such as in the distributed certificate. (i) We first present a multisignature scheme MS − SM2 based on the SM2 signature by designing a cosigning protocol and prove its security in plain public-key and semihonest model. Bellare and Neven [7] proposed a new practical multisignature scheme based on the Schnorr signature without KOSK assumption and proved that it can avoid rogue attack in the so-called plain public key model. Public key aggregation is introduced to a multisignature scheme by which the verifier can check the validity of a multisignature only using a short aggregate key rather than a public key list [16, 17]

Preliminaries

Multisignature Scheme

SM2-Based Multisignature Scheme

Applications to Vehicular Networks

Conclusions