Research on The Secure Transmission Method of Terminal Upgrade Files based on Dynamic Encryption Key

In order to improve the secure transmission capability of terminal upgrade files, we proposed a secure transmission method of terminal upgrade files based on dynamic encryption key. This method realized the access control of terminal upgrade file by using no proxy key publishing protocol, designed the dynamically symmetric key for the terminal upgrade file. The encoding calculation of terminal upgrade files in the process of secure encryption is carried out based on bilinear mapping method. We scrambled and rearranged the terminal upgrade files according to the intensity of plaintext attack, then adopted the random linear coding method to encrypt the terminal upgrade files by dynamic symmetric key and realize the secure transmission for the files. Simulation results show that this method can effectively improve the security transfer performance of upgrade files, and can meet the requirements of current business applications.