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Bitcoin is a kind of novel distributed electronic cash free of any governmental influence and supervision. Its irreversibility, pseudonymity and unforgeability have made great developmental leaps in means of payment and investment management. However, when the application of the means of payment is applied in small and medium-sized enterprises or companies, bitcoin lacks the mechanism to be jointly...
In this paper, we investigate the connectivity of random cognitive radio networks with different routing schemes. Two coexisting ad hoc networks are considered with m primary users (PUs) and n secondary users (SUs) randomly distributed in a unit area. The relation between n and m is assumed to be n = mβ. We show that with the HDP-VDP routing scheme, which is widely employed in the analysis of throughput...
Vehicular ad hoc networks (VANETs) have recently attract extensive attentions as a promising technology for improving traffic safety and efficiency. To make VANETs practical, security, privacy and efficiency are important issues. Anonymity preserving of group signature and lower overhead in verification of batch signature make these two kinds of signatures right tools to design VANET communication...
The secure authentication and transaction is one of the important parts in networking security. Because of the security flaws of some existing schemes, this paper proposes a secure authentication and transaction protocol based on digital certificates and dynamic password. The protocol not only can realize the mutual authentication of the client and server, but also can achieve secure authentication...
Though security and privacy are two important issues in vehicular networks, limited works are done on the design of communication protocol until recently. Several proposals tackle these issues in the cryptographic way, such as using group signature to construct vehicular communication protocol. The proprieties of anonymity and traceability make group signature to the purpose to be used in designing...
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