Digital signature method for secure communication in Internet of things

The invention provides an authorized digital signature method for sensor network communication in the secure Internet of things, which belongs to the technical field of communication and is used for performing authorization and encryption on the sensor communication process in the secure Internet. The method specifically comprises the steps of firstly controlling the data transmission process by adopting an authorized signature mode, reasonably scheduling signature data, and restricting the signature condition. The scheme is based on a bilinear paring problem, and the security and signature efficiency of the scheme are guaranteed. Meanwhile, private key splitting is performed so as to enable the scheme to be more suitable for the limitations on the aspects of computing power, storage spaceand energy reserve of nodes in the Internet of things. In addition, the scheme uses the timestamp, facilitates the condition screening after data transmission while solving replay attacks, and determines the correctness of t