The rapid development of 5G networks has made smart driving possible. The vehicular ad-hoc networks (VANETs) are the main environment for smart driving, providing road information, instant communication between vehicle and vehicle (V2V) or vehicle and infrastructure (V2I). The information interaction security of VANETs is critical to the proper functioning of the traffic. Much research in recent years has focused on secure communication in VANETs, especially the secure V2V or V2I communications. However, current security schemes often require complex identity re-authentication when vehicles enter a new infrastructure coverage, which greatly reduces the efficiency of the entire network. In addition, the emergence of blockchain has created opportunities to overcome the challenges in VANETs mentioned above. In this paper, blockchain is utilized to enhance the scalability of the trustworthiness scalable computation. The proposed blockchain assisted trustworthiness scalable computation based V2I authentication (B-TSCA) scheme achieves rapid re-authentication of vehicles through secure ownership transfer between infrastructures. Note that, trustworthiness scalable computation assisted by blockchian technology ensures the decentralization and non tamperability of the scalable computation result. The scheme is proved secure. The time cost of the novel handover authentication phase is half of that of the initial one as is presented in the simulation.

The delay of vehicle emergency has led to many serious consequences. A series of studies has been carried out in the field of information security in vehicular ad hoc networks (VANETs). However, open issues such as the authentication of emergency vehicle (EV) avoidance are remaining unsolved. In this article, we propose a novel lightweight authentication protocol to avoid EVs in VANETs. In our protocol, after completing the first mutual authentication with the nearest roadside unit (RSU), EV can complete the mutual identity authentication with the subsequent RSUs without repeating cumbersome calculations. Additionally, EV is required to verify the legitimacy of the driver’s identity when starting to avoid some illegal driving behavior. The RSUs will broadcast avoidance information to ordinary vehicles in their jurisdiction to remind them to clear a temporary emergency lane for EVs in advance. With temporary emergency lanes, emergent mission delays due to traffic congestion could be reduced. The security analysis and efficient analysis prove that our protocol is practical and efficient against attacks, such as impersonation attacks, device theft attacks, reputation attacks, etc.

Internet of Things (IoT) is a research field that has been continuously developed and innovated in recent years and is also an important driving force for the improvement of people’s life in the future. There are lots of scenarios in IoT where we need to collaborate through devices to complete tasks; that is, a device sends data to other devices, and other devices operate on the aid of the data. These transmitted data are often users’ privacy data, such as medical data and grid data. We propose an instant encrypted transmission based security scheme for such scenarios in IoT. The analysis in this paper indicates that our scheme can guarantee the security of users’ data while ensuring rapid transmission and acquisition of instant IoT data.

With the development of novelinformation technologies and transportation systems, vehicular ad hoc networks (VANETs) have become an important means to improve drivers' driving experience and reduce road accidents. There are still some issues regarding vehicle privacy information security and information transmission efficiency in VANETs. To address these challenges, edge nodes are utilized to verify signatures in some existing work, which can reduce the computational overhead of the trusted authority (TA) and improve the efficiency of authentication schemes. Although authentication efficiency has been improved, these schemes also bring potential security risks. Edge nodes located in outdoor environments are vulnerable to attack, which may result in problems with verification. The TA may verify security parameters twice, such as identities or signatures, resulting in a redundant authentication problem. An authentication scheme assisted by edge nodes is proposed in this article as a solution to this problem. Road-side units (RSUs) serve as edge nodes to verify messages from vehicles and generate lists of valid and invalid messages via a batch detection algorithm, to assist the TA in checking authentication results. Furthermore, the TA can get a correct and valid message list only by a batch check of RSUs results. The proposed scheme also provides an efficient solution to the problem of authentication. In addition, by delegating most authentication tasks to RSUs, the overall efficiency of the scheme is improved. For example, when 100 messages are generated, the batch authentication overhead and transmission overhead of the proposed scheme are approximately 98 $%$ and 61 $%$ of the ECC-based scheme proposed by He et al. The security analysis and experimental analysis demonstrate that the proposed scheme meets the security requirements of VANETs and has a smaller computational overhead and communication cost than previous work.

With global economic integration, transnational trade plays an important role, and maritime transportation is one of the important means of freight transportation. It is of great significance to build a secure and efficient maritime transportation system (MTS). The introduction of Internet of things technology makes MTS more perfect. The IoT-enabled MTS is composed of marine terminals and on-board sensors, land-based data centers and base stations, as well as satellite networks. Many researchers have carried out significant work to aggregate data in MTS. However, because the terrestrial base stations cannot cover most of the sea area, the isolated maritime terminals, those who drive to the area without base station coverage, need the assistance of satellite networks to complete the contact with the data center. In this paper, we propose an attribute based secure data aggregation scheme for isolated IoT-enabled MTS. In the novel scheme, the constant attributes of a maritime terminal are utilized to generate its certification. In addition, on-board sensors are introduced in the system to help aggregate the status and surrounding environment of the maritime terminal. These monitoring data are encrypted by the sensors and transmitted to the data center for the trustworthiness evaluation of the isolated maritime terminal. Besides, the zero-knowledge proof is utilized to confirm the legitimacy of participating users. What's more, the security analysis and the simulation results show that the novel scheme is secure and efficient for IoT-enabled MTS.