Abstract: 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.

Key words: attributebased encryption, revocable, cloudedgeend computing, ciphertext retrieval, edge computing

摘要： 随着云计算和云存储技术的快速发展，云端密文检索的需求日益增加.然而，传统的密文检索方案在多用户环境下难以高效地实现细粒度的访问控制，同时存在计算开销大、难以灵活管理用户权限属性等问题.因此，提出一种支持多用户的可撤销属性基轻量级密文检索方案.首先，考虑到用户检索开销大，该方案将用户端大量计算开销外包至代理服务器，实现本地轻量级计算.其次，在多用户场景下将属性基加密和可搜索加密技术相结合，实现高效的细粒度访问控制.最后，引入区块链技术，确保撤销过程的透明性和不可篡改性，保证了灵活可信的用户属性管理.安全分析表明，检索过程中，用户隐私以及云端数据得到安全保护.性能分析表明，该密文检索方案在实际应用中是高效可行的.

关键词: 属性基加密, 可撤销, 云边端计算, 密文检索, 边缘计算