A secure certificateless ring signcryption scheme based on SM2 algorithm in smart grid

In the context of smart grids, bidirectional transmission of electricity information enables real-time electricity generation tailored to consumer needs. However, ensuring user privacy during data collection has emerged as a significant concern with the proliferation of data collection and transmission capabilities. Existing solutions such as group signature and pseudonym systems have limitations, such as a lack of trustworthiness in group signature administrators and increased system costs associated with pseudonym storage. To address these drawbacks, this paper proposes a certificateless ring signcryption scheme with conditional privacy protection based on the SM2 algorithm. The scheme efficiently enables users to ring signcryption-transmitted messages, thereby concealing the sender's identity from the message receiver. This approach resolves the privacy concerns mentioned earlier. In addition, tracking algorithm and batch verification algorithm have been designed to improve computational efficiency while also providing the ability for trusted parties to track malicious users. This scheme achieves conditional privacy preservation while avoiding substantial storage costs for power resources. Compared to the latest available programs, our proposed scheme offers enhanced efficiency and lower communication costs.