Attribute-based Sanitizable and Collaborative Data Sharing Scheme in Medical Scenarios

Ciphertext policy attribute-based encryption(CP-ABE) is a mechanism that enables secure fine-grained access control of encrypted data,ensuring that only authorized users can access the data and avoiding unauthorized access and leakage in cloud environments to guarantee the safety of data.However,with the rapid development of cloud computing and IoT technology,traditional CP-ABE scheme is gradually unable to meet requirements of data sharing in terms of access policy expression and ciphertext security requirements in new medical IoT applications,such as multidisciplinary consultation,patient privacy data storage.This paper proposes an attribute-based sanitizable and collaborative sharing scheme in medical scenarios,which can effectively deal with malicious data owners by sanitizing ciphertext.Additionally,this method can specify collaborative nodes in the access structure,allowing users with different attribute sets to collaborate to obtain access rights.Security analysis shows that the proposed scheme has indistinguishable security under chosen plaintext attack.Performance analysis shows that compared with other schemes,the proposed scheme has lower computational overhead.