计算机科学 ›› 2021, Vol. 48 ›› Issue (6A): 529-532.doi: 10.11896/jsjkx.200700049
姜昊堃, 董学东, 张成
JIANG Hao-kun, DONG Xue-dong, ZHANG Cheng
摘要: 通过对文献[8]提出的一种基于无证书的前向安全代理盲签名方案进行安全性分析发现,其方案无法抵抗恶意且消极KGC的公钥替换攻击,且该方案不满足不可否认性。针对以上问题,提出了一个改进方案,在用户密钥生成方式上做出了改进,通过单向哈希函数将用户公钥嵌入到部分私钥中,进而约束KGC生成的部分私钥,使得敌手无法伪造出合法密钥对进而冒充原始签名者进行授权。在代理盲签名阶段由消息拥有者的秘密值取代一个盲化因子,不仅能够减小计算量,而且消息拥有者也无法否认曾提供过该消息。安全性分析表明,改进方案能够抵抗恶意且消极KGC的公钥替换攻击并且满足不可否认性。效率分析表明,改进方案比原方案的计算效率更高。
中图分类号:
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