CP-ABE Scheme Supports Fully Policy and Attribute Hidden

The existing ciphertext-policy attribute-based encryption schemes that support policy or attribute hiding can achieve fine-grained access control for privacy protection,but most of them only realize partial policy hiding of attribute values,and ignore the problem of hiding user attributes during key generation,which is still prone to user privacy information leakage.To address the above problems,a CP-ABE scheme that fully hides access policy and user attributes for data access control and user privacy information protection during key generation is proposed.Firstly,the attribute Morton filter(AMF) is proposed,in which the access policy is fully hidden in the AMF during the encryption phase,and the user can efficiently query and accurately determine the position of attributes in the policy during the decrypt phase.Secondly,a zk-SNARKs-based key generation method is developed to effectively conceal the user attributes throughout the key generation process.Finally,security and performance analysis are conducted to evaluate the proposed scheme,demonstrating its indistinguishability under chosen-plaintext attack security without compromising efficiency.