Data Encryption Transmission and Authentication Scheme Based on Blockchain Technology Aiming at the security problem of data network transmission between smart car and server, based on the identity authentication technology in blockchain, a data encryption transmission and authentication scheme is proposed. Based on the identity authentication technology in the blockchain, the identity authentication of the car after data transmission is realized. Through the DiffieHellman algorithm, the key exchange between the car and the server is realized. After combining the two technologies, the proposed scheme can not only realize the encrypted transmission of data, but also effectively carry out identity authentication, which greatly improves the security of data transmission between the car and the server.

A Security Transmission and Storage Solution about Sensing Image for Blockchain in the Internet of Things With the rapid development of the Internet of Things (IoT), the number of IoT devices has increased exponentially. Therefore, we have put forward higher security requirements for the management, transmission, and storage of massive IoT data. However, during the transmission process of IoT data, security issues, such as data theft and forgery, are prone to occur. In addition, most existing data storage solutions are centralized, i.e., data are stored and maintained by a centralized server. Once the server is maliciously attacked, the security of IoT data will be greatly threatened. In view of the abovementioned security issues, a security transmission and storage solution is proposed about sensing image for blockchain in the IoT. Firstly, this solution intelligently senses user image information, and divides these sensed data into intelligent blocks. Secondly, different blocks of data are encrypted and transmitted securely through intelligent encryption algorithms. Finally, signature verification and storage are performed through an intelligent verification algorithm. Compared with the traditional IoT data transmission and centralized storage solution, our solution combines the IoT with the blockchain, making use of the advantages of blockchain decentralization, high reliability, and low cost to transfer and store users image information securely. Security analysis proves that the solution can resist theft attacks and ensure the security of user image information during transmission and storage.