计算机科学 ›› 2020, Vol. 47 ›› Issue (1): 309-314.doi: 10.11896/jsjkx.181202416
左黎明,陈兰兰
ZUO Li-ming,CHEN Lan-lan
摘要： 传统的基于身份标识的密码体制存在着密钥托管问题,当私钥生成器出现安全问题时,易造成整个密码系统瘫痪,因此解决密钥托管问题一直是密码学研究的一个热点。对此,文中提出了一种基于身份标识的特殊数字签名方案,该方案无需可信的第三方介入。首先,在随机预言机模型以及计算性Diffie-Hellman(Computational Diffie-Hellman,CDH)困难问题的假设下,证明了方案的安全性;然后,与几种基于身份的数字签名进行理论上的性能比较和分析;最后,基于PBC(Pairing-Based Cryptography)库,采用C语言实现了签名方案,并对几种签名方案的实际运行效率进行了分析。实验结果表明,文中提出的方案平均总耗时约为0.148s,相比Subhas和Neetu方案的平均总耗时分别减少了约11.9%和13.5%,与Shamir和Boneh方案的耗时接近。因此,所提方案的计算复杂度较低,效率较高,适用于危险品运输监测等数据保护要求较高的应用场景。
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