云计算环境下的高效的多授权方属性加密方案

摘要

云计算环境下的信息安全保密十分重要，针对以往的加密方案无法适应云环境下灵活的访问控制特点，提出了一个能够达到灵活访问云存储数据的属性加密方案，在多授权方的情形下，提供了可行的密钥管理，并且确保了可行的用户撤销，具有很强的实用性，在一般双线性群模型下和随机预言机模型下，可以证明本方案是安全的。%In cloud computing environment, information security is very important. The existing encryption schemes have the disadvantages that they cannot adapt to the flexible access control features of cloud environment. In this work, we aim to make attribute-based encryption more suitable for access control to data stored in the cloud, concentrate on giving to the encryptor full control over the access rights, providing feasible key management even in case of multiple independent authorities, and enabling viable user revocation, which is essential in practice. The formal security proof of our scheme is given in the generic bilinear group and random oracle models.