Homomorphic Proxy Re-Signcryption Scheme and Its Application in Edge Computing-Enhanced IoT

Proxy re-signcryption combines the functionalities of re-encryption and re-signature in a single logical step, outperforming a simple combination of re-encryption and re-signature schemes. Proxy re-signcryption ensures the confidentiality of data transmission as well as the anonymity of the sender's identity in the public network, so it can be applied in smart grid, machine learning and other fields. However, only a few proxy re-signcryption schemes exist, and none of them support the homomorphic operations of ciphertext data. In this paper, we offer a homomorphic proxy re-signcryption scheme that leverages batch verification and achieves the conversion between ciphertext and signature. Based on the proposed proxy re-signcryption scheme, we also give a privacy-preserving data aggregation scheme for edge computing-enhanced IoT, which allows the control center to perform statistical analysis and processing on the data collected by IoT devices.