摘要
提出了一个具有密文匿名性的前向安全的短签密方案,该方案可有效地保护密文收发方的身份隐私,并在随机预言机模型下证明了本方案具有语义安全性、不可伪造性、前向安全性、密文匿名性和公开验证性.在计算效率方面,签密过程只需要2个群标量乘运算,解密过程只需要2个双线性运算和1个群标量乘运算.与现有的短签密方案比较,新方案在安全性方面具有更强的安全性,且计算量小,密文长度短,更适合于带宽受限和签密收发双方身份保密的应用需求.
A short signcryption scheme with ciphertext anonymity and forward security is proposed,which can protect the privacy of the sender and the receiver identities. The security models,including semantic security,unforgeability,ciphertext anonymity,forward security and verifiability,are analyzed in the random oracle models. In computational cost,the proposed scheme only need two scalar multiple operators in signcryption phase and two bilinear pairings and one scalar multiple operators in unsigncryption phase. Compared with the short signcryption schemes up to date,the computational costs of the new scheme are lower than those of signcryption schemes available where it has stronger security components,which can be used in the security requirement such as bandwidth constraint and identity hiding.
出处
《北京邮电大学学报》
EI
CAS
CSCD
北大核心
2010年第4期131-134,144,共5页
Journal of Beijing University of Posts and Telecommunications
基金
国家自然科学基金项目(60773175
60973134)
现代通信国家重点实验室基金项目(9140C1108020906)
广东省自然科学基金项目(9151064201000058)
关键词
短签密
密文匿名
前向安全
双线性映射
short signcryption
ciphertext anonymity
forward security
bilinear pairings
