摘要
为了使保密信息能够通过不安全的广播信道安全地发送给已授权接收的用户集,对Selvi IBBSC方案进行研究,提出了一个改进的基于身份的广播签密方案。方案建立基于身份的广播签密方案构架,利用椭圆曲线上的双线性对,形成了具有安全性和高效性的广播签密方案。先分析了方案的正确性,然后基于判定双线性Diffie-Hell-man假定在随机预言模型下分析了密文的不可区分性以及基于计算性Diffie-Hellman假定分析了签名的不可伪造性,最后简要分析了方案的有效性。结果表明,提出的方案能够对保密和认证的双重问题提供有效处理,具有较强的安全性,能够有效地提高广播网络应用环境的安全性;并且方案减少了部分广播参数,解签密计算时间花费相对较少,具有高效性。
In order to securely transmit the privacy information to authorized users＇ set through the unsafe channel,an identity-based broadcast signcryption scheme（IBSC） based on Selvi IBBSC scheme was proposed.In the IBSC,the ID-based signcryption scheme for broadcast communication＇ schema was put up,and using bilinear pairing on elliptic curves,a new secure,efficiently identity-based broadcast signcryption scheme was proposed.Firstly the correction was analyzed,and then signcryption schemes were proven to be secure against adaptive chosen ciphertext attacks and adaptive chosen message attacks under decisional bilinear Diffie-Hellman assumption and computational Diffie-Hellman assumption respectively.Lastly the efficiency of IBSC was analyzed simply.The results showed that the proposed scheme,which provids the efficient solution to the dual problem of confidentiality and authentication,is secure in the random oracle model and could efficiently improve the security of Broadcast network,and more efficient in reducing the broadcasting parameter and the computing consumption of Designcypt.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
2012年第1期118-122,共5页
Journal of Sichuan University (Engineering Science Edition)
基金
国家重点基础研究发展规划资助项目(2011CB302903)
国家自然科学基金资助项目(6107318860873231)
中国博士后科学基金资助项目(20100471355)
江苏高校优势学科建设工程资助项目(yx002001)
关键词
基于身份的密码体制
签密
双线性对
广播
identity-based cryptography
signcryption
bilinear pairing
broadcast
