摘要
为降低密文策略基于属性加密(CP-ABE,ciphertext-policy attribute-based encryption)体制中私钥泄漏带来的损害,首先给出了前向安全CP-ABE体制的形式化定义和安全模型,然后构造了一个前向安全的CP-ABE方案。基于判定性l-BDHE假设,给出了所提方案在标准模型下的安全性证明。从效率和安全性2个方面讨论了所提方案的性能,表明所提方案在增强CP-ABE体制安全性的同时,并没有过多地增加计算开销和存储开销,更适合在实际中应用。
To mitigate the damage of key exposure in the context of ciphertext-policy attribute-based encryption （CP-ABE）. The syntax and security model of forward-secure CP-ABE was presented. Then, a concreted forward-secure CP-ABE scheme was constructed. Under the I-BDHE assumption, the proposed scheme was proved secure in the stan- dard model. Furthermore, the performance of the proposed scheme was discussed in terms of security and efficiency. The results demonstrate that the proposed scheme strengthens the security of CP-ABE, without getting overmuch cost of computation and storage, and thus is more feasible for practical applications.
出处
《通信学报》
EI
CSCD
北大核心
2014年第7期38-45,共8页
Journal on Communications
基金
国家重点基础研究发展计划("973"计划)基金资助项目(2012CB315905
2012CB315901)
中国博士后基金资助项目(2014M552524)~~
关键词
前向安全
私钥泄漏
基于属性加密
可证明安全
forward-secure
key exposure
attribute-based encryption
provable security
