摘要
文章通过对一种新的无证书签密方案的安全性分析,发现该方案存在用户公钥被替换的漏洞。针对此不足,提出一个改进的方案,在随机预言机模型中,基于离散对数问题(discrete logarithm problem,DLP)、判定双线性Diffie-Hellman(decisional bilinear Diffie-Hellman,DBDH)问题困难性的假设下,证明了改进方案的机密性和不可伪造性。
The security of a new certificateless signcryption scheme is analyzed, and it is found that there exists a defect in the scheme which is the replacement of user＇s public key. In view of this defect, an improved scheme is proposed. It is proved that the improved scheme is confidential and existentially unforgeable under the discrete logarithm problem（DLP） and decisional bilinear Diffie-Hellman（DB- DH） assumptions in the random oracle model.
出处
《合肥工业大学学报（自然科学版）》
CAS
CSCD
北大核心
2016年第7期917-923,共7页
Journal of Hefei University of Technology：Natural Science
基金
国家自然科学基金资助项目(61240025
11061014)
江西省高校科技落地计划资助项目(KJLD12067)
江西省教育厅科研资助项目(GJJ13339)
华东交通大学校立科研基金资助项目(11JC04)
关键词
无证书
签密
双线性映射
公钥替换
随机预言机模型
certificatelessness
signcryption
bilinear mapping
public key substitution
random oraclemodel
