中文摘要：

针对数据外包环境中属性的细粒度撤销,借助于数据外包管理服务器和密钥加密密钥,提出一种间接模式下支持即时撤销的属性基加密方案。首先给出外包环境中支持撤销的属性基加密定义和安全模型,其次给出具体的支持撤销的密文策略——属性基加密方案并对安全性进行证明,最后,与其他方案进行对比,该方案在密文和密钥长度方面都有所减少。另外,方案实现对用户部分属性进行细粒度撤销,支持属性的即时撤销,即使用户错过密钥即时更新的信息,也只需在解密密文前更新自己的密钥,更加贴近于实际环境。

英文摘要：

In order to support fine-grained attribute revocation in data outsourcing systems, an attribute-based encryption scheme with efficient revocation in indirect revocation model was proposed. The model of ABE supporting attribute revocation was given, and a concrete scheme was constructed which proved its security under the standard model. Compared to the existing related schemes, the size of ciphertext and private/secret key is reduced, and the new scheme achieves fine-grained and immediate attribute revocation which is more suitable for the practical applications.