Secure Data Sharing Based on SM9 for Privacy Preserving Computing

Privacy preserving computing (PPC) allows participants with different local data to do computations without revealing their sensitive data. Hence, ensuring data security and privacy is essential for PPC. SM9 is a Chinese national standard and international standard for identity-based encryption (IBE). Compared to other IBE schemes, SM9 has better performance. At present, there is no proxy re-encryption scheme based on SM9 available for data sharing scenarios in cloud environments. In this paper, we introduce a novel data sharing framework called SM9-PRE, which is based on a new proxy re-encryption scheme using SM9. Our framework allows participants to outsource and to share data through the cloud fluently without revealing any information of the data to the cloud. We conducted a series of experiments on our framework, and the experimental results showed that our framework is more efficient and practical than previous ones.