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Using a biometric as an identity has the advantage that identities are unique if the underlying biometric is of a good quality, such as fingerprints, faces, irises, etc. However, biometric measurements are noisy and the existing identity-based systems cannot be used directly to construct this scheme. The error-tolerance property(Fuzzy) can be used to solve this problem. Based on the error-tolerance property, a new biometric identity based signature scheme is proposed. Our scheme is constructed in the standard model and achieves a strong security-full security. In addition, the security of our scheme is reduced to a generalized assumption-Computation Diffie-Hellman(CDH) assumption instead of other strong assumptions.

With the promotion of Remote Medical Treatment, the sharing of big telemedicine data becomes more and more popular. Telemedicine based on wireless sensor networks collects blood pressure, pH value, pulse, and other medical information from the telemedicine healthcare terminal. The medical information is sent to the hospital or medical server for processing. The security protection of patient medical data, such as confidentiality and authenticity, has gradually become a critical problem to be solved in the development of cloud medical service platform. A provably secure identity-based designated-verifier proxy signature scheme with information recovery for cloud medical diagnosis network is proposed. The scheme is on the basis of computational Diffie-Hellman difficult problem and existential unforgeable against adaptive chosen message attacks in the random oracle model. The performance analysis shows that the scheme is appropriate to the remote medical diagnosis system.

Combined electric vehicles with smart grid, Vehicle-to-Grid (V2G) resolve the problem of charging large-scale electric vehicles, and make vehicles as mobile and distributed storage unit accessing to smart grid. V2G requires more efficient authentication protocol to meet fast response and information processing in real-time. Batch authentication can provide large computational savings when several signatures are verified together, which is appropriate for aggregators to verify PHEVs/PEVs. This paper proposes a modified batch authentication protocol based on hybrid cryptography, which takes advantage of public key cryptology to identity authentication and transmit shared session key. Furthermore, the comparison and analysis of the modified with existing batch authentication in V2G are given.

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