Personal Health Record Scheme with Attribute Revocation from Lattice

Personal health record (PHR) sharing is an efficient and convenient service to exchange medical information. To achieve information sharing, the data owners upload the personal files to a third-party cloud data server. However, the data privacy is worth considering. This scheme provides the data confidentiality and achieves fine-grained access to attributes based on ciphertext-policy attribute-based encryption（CP-ABE） scheme. Moreover, our attribute revocation property is used to handle the changes of user access permissions. Finally, the scheme is proved to be secure under the selective-attribute and chosen plaintext attack model under the learning with error （LWE） problem without random oracles.