标准模型下基于身份的签密密钥封装  

IDENTITY-BASED SIGNCRYPTION KEY ENCAPSULATION IN STANDARD MODEL

作　　者：王斌斌[1] 段娜[1] 张晓丽[2] 

机构地区：[1]河南城建学院计算机科学与工程学院,河南平顶山467036 [2]信阳师范学院,河南信阳464000

出　　处：《计算机应用与软件》2015年第6期288-291,319,共5页Computer Applications and Software

基　　金：国家自然科学基金项目(51275239)

摘　　要：针对随机预言模型下的签密密钥封装机制依赖现实世界无法实现的随机预言假设的问题,提出在标准模型下可证明安全的基于身份签密密钥封装机制(IBSC-KEM)。新提出的IBSC-KEM方案基于一种受到广泛研究的身份加密机制,在标准模型下被规约为求解q-ABDHE问题和判定性q-ABDHE问题,具有机密性和不可伪造性。新方案主要计算开销为5次群G上的指数运算、3次群GT上的指数运算和3次双线性对运算,与类似的签密方案比较,计算开销较低。此外,新方案还具有公开可验证性,适用于构建安全的端到端传输。For the problem that the signcryption key encapsulation mechanism in random oracle model may not be achieved in real world due to relying on the random oracle assumption,we propose an identity-based signcryption key encapsulation mechanism （IBSC-KEM）which is security provable in standard model.Based on a widely studied identity-based encryption mechanism,in standard model the new IBSC-KEMscheme is deduced to resolving q-ABDHE problem and decisional q-ABDHE problem,and has confidentiality and unforgeability as well.The computation overheads of the new scheme are mainly the exponentiations operations in quinary G,the exponentiations operations in tertiary GT and the tertiary bilinear pairing operations.Comparing with similar signcryption schemes,the new scheme has lower computational overhead.Additionally,the new scheme is provided with public verifiability and is suitable for constructing the secure point-to-point transmis-sion.

关 键 词：身份密码学 双线性映射 签密 密钥封装 标准模型 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]