支持多用户的可撤销属性基轻量级密文检索方案OA

With the rapid development of cloud computing,the demand for ciphertext retrieval on the cloud has been increasing.However,traditional ciphertext retrieval schemes struggle to efficiently implement fine-grained access control in multi-user environments and face challenges such as high computational overhead and inflexible management of user attribute permissions.Therefore,this paper proposes a multi-user revocable attribute-based lightweight ciphertext retrieval scheme.Firstly,to reduce the computational burden on users,intensive computations are outsourced to a proxy server,enabling lightweight local operations.Secondly,the scheme integrates attribute-based encryption and searchable encryption to achieve efficient fine-grained access control in multi-user environments.Lastly,the scheme incorporates blockchain technology to ensure a transparent and immutable revocation process,enabling flexible and trustworthy user attribute management.Security analysis demonstrates that both user privacy and cloud-stored data are effectively safeguarded.Performance analysis indicates that the proposed ciphertext retrieval scheme is efficient and feasible for practical applications.