摘要
为了提高基于属性加密技术的计算效率,对属性基加密构造中重要的一环访问策略进行了优化,基于有序二元决策图(OBDD)提出了一种新型的无配对CP-ABE方案。一方面,所提方案基于椭圆曲线密码技术,将传统CP-ABE方案构造中复杂的双线性配对运算替换为较为轻量级的标量乘法,降低了方案整体的计算开销。另一方面,所提方案采用基于OBDD的访问结构,该类型访问结构不仅能表示任何关于属性的布尔表达式,还能同时支持访问策略中属性的正负值,密钥的长度不随属性的个数而正比变化,密文长度也仅与访问策略中有效路径的个数有关。安全性和性能分析结果表明,所提方案在判定性Diffie-Hellman(DDH)假设下满足选择性选择明文安全,且方案的计算效率能满足物联网的实际应用需求。
To improve the computational efficiency of ABE,its access structure was optimized and a pairing-free CP-ABE scheme based on ordered binary decision diagram(OBDD)was proposed.Based on the elliptic curve cryptog-raphy,the complex bilinear pairing operation in traditional CP-ABE was replaced with the relatively lightweight scalar multiplication,thus the overall computation overhead was reduced.And OBDD was used as the access structure of CP-ABE,which can not only represent any Boolean expression about attributes,but also support both positive and nega-tive attributes.The length of the key was independent of the number of attributes and the length of the ciphertext was on-ly related to the number of valid paths in the access policy.The security and performance analysis show that the scheme can resist chosen plaintext attack under the decisional Diffie-Hellman(DDH)assumption,and the computation efficiency can meet the practical application requirements of Internet of things.
作者
丁晟
曹进
李晖
DING Sheng;CAO Jin;LI Hui(School of Cyber Engineering,Xidian University,Xi’an 710071,China)
出处
《通信学报》
EI
CSCD
北大核心
2019年第12期1-8,共8页
Journal on Communications
基金
国家重点研发计划基金资助项目(No.2017YFB0802700)
国家自然科学基金资助项目(No.61772404,No.U1836203)~~
