Anonymous Hierarchical Identity-based Encryption EHR Sharing Mechanism Based on SM9

The identity-based encryption (IBE) scheme SM9 is a commercial encryption standard in China and has been used as a basic building block for authentication. Currently, to accommodate large-scale application scenarios, a variant hierarchical identity-based encryption (HIBE) scheme has been constructed on the basis of SM9. However, there still a problem that the ciphertext may leak the identity of the recipients. An anonymous HIBE has been developed based on SM9 to realize the anonymization of data recipients. Moreover, the anonymous HIBE scheme will be proven to have adaptive secure under the standard model. The performance of the anonymous HIBE is evaluated, the experimental results are comparable to the classical AHIBE algorithm which show the practicability of the scheme.