With the emergence of the Internet of things (IoT) and the rapid development of Mobile Network Devices, data collection and storage become more convenient and fast, especially for the edge computing and development in the cloud. However, the uncertain time-delay, lack of mobile support, location-sensitive and other problems, the efficiency and security of data storage are greatly tested in the process of data storage in cloud computing. In order to solve these problems, fog Computing came into being. In this paper, we use the Internet of things (IoT) equipment to cloud data transmission and security audit in Intelligent Transportation System (ITS), and use the techniques of Bilinear map, homomorphic verifier and CDH difficult problem hypothesis, etc. A secure storage and Public Audit Protocol for step-by-step Storage and signature verification is proposed to improve the storage efficiency and security audit of fog-to-cloud data. And through theoretical analysis and verification, the security and efficiency of the protocol are analyzed, which can achieve the desired effect.
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