Security sharing of smart city communication data based on blockchain technology

Abstract

When the smart city communication data is safely shared, the sharing process is mainly realized through single authorization attribute base encryption, and the key and ciphertext cannot be updated in time, which makes the encryption and decryption process in the data security sharing process take long. Therefore, relying on the blockchain attribute encryption algorithm, a new smart city communication data security sharing method is designed. Relying on the principle of attribute base encryption, the data encryption algorithm is designed to realize the encryption and decryption of smart city communication data. In chronological order, all encrypted data are stored on the block sharing chain, and the corresponding keys and ciphertext are quickly generated by the request of multiple nodes participating in joint computing. Finally, through the OBDD (orderly binary decision chart) access structure, the data on the sharing chain is efficiently accessed to realize the secure sharing of communication data. The experimental results show that when the proposed method is applied to share the data in smart city communication, the average time of data encryption and decryption is 1. 9s,0.2s, which greatly reduces the cost of data security sharing.