Abstract
Since the roadside infrastructure and vehicles come from different manufacturers, vehicular ad hoc networks (VANETs) now are extremely heterogeneous. It is difficult to communicate securely for heterogeneous facilities in VANETs because secure communication needs to concurrently realize confidentiality, authentication, integrity, and non-repudiation. To meet the above security attributes in one logical step, four bi-directional signcryption schemes are proposed for specific heterogeneous vehicle to infrastructure (V2I) communication in this paper. The first scheme supports batch verification, which allows multiple vehicles registered in a public key infrastructure (PKI) system to transmit messages to a receiver in an identity-based cryptosystem (IBC), both which are the mainstream public key cryptosystems. The second scheme supports a sender in a PKI to securely broadcast a message to multiple vehicles in an IBC. The communication direction of the latter two schemes is opposite to the former two schemes (i.e., from IBC to PKI). All these schemes can be proved to satisfy confidentiality and unforgeability based on the assumptions of decisional and computational Diffie-Hellman problems in the random oracle model. Furthermore, numerical analyses and simulation results demonstrate the computation costs, communication costs, storage, and the aggregate ciphertext length of our schemes are better than the existing ones.
Highlights
Smart transportation is one of the most important aspects of smart city, and vehicular ad hoc networks (VANETs) have recently been regarded as a promising smart transportation technique that can provide road safety, traffic management, and so on
roadside units (RSUs) in public key infrastructure (PKI)/identity-based cryptosystem (IBC) freely broadcasts a message to many vehicles in IBC/PKI, which are especially designed for a RSU broadcasting message to vehicles in V2I communication scenario of VANETs
Since other schemes in [23,26] only provide one-way heterogeneous communication, the comparisons are divided into PKI→IBC in Table 2 and IBC→PKI in Table 3 just for more scientific and elaborate results
Summary
Smart transportation is one of the most important aspects of smart city, and vehicular ad hoc networks (VANETs) have recently been regarded as a promising smart transportation technique that can provide road safety, traffic management, and so on. In the paper, considering the aforementioned security attributes of V2I communication, we construct four practical bi-directional signcryption schemes, which offer heterogeneous V2I secure and efficient communication, in which the vehicles and the RSUs are registered in public key infrastructure (PKI) or identity-based cryptosystem (IBC), respectively. Two many-to-one heterogeneous signcryption schemes are proposed, which allow a large number of vehicles registered in the PKI/IBC freely communicating with a RSU registered in IBC/PKI. RSU in PKI/IBC freely broadcasts a message to many vehicles in IBC/PKI, which are especially designed for a RSU broadcasting message to vehicles in V2I communication scenario of VANETs. Inspired by the idea of signcryption and aggregation, our proposed many-to-one heterogeneous aggregate signcryption schemes support batch verification, which can save a lot of time compared with the traditional sequential verifications, and can save the computational, communicational, and storage cost.
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