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电子学报  2015 

对一个匿名多接收者签密方案的安全性分析与改进

DOI: 10.3969/j.issn.0372-2112.2015.11.008, PP. 2187-2193

Keywords: 多接收者签密,匿名性,基于身份的签密,拉格朗日插值

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Abstract:

2011年,庞等人利用拉格朗日插值多项式方法构造了一个新的基于身份的多接收者匿名签密方案,并声称在其方案中任何攻击者或合法接收者都无法获取其他合法接收者的身份信息,从而能够保护接收者隐私.本文对庞等人的多接收者签密方案进行安全性分析,发现其方案中任何接收者对于其他接收者都无法实现匿名.同时,本文在其方案基础上进行改进,提出了一种改进方案,以弥补其安全缺陷.最后在随机预言模型下,对改进方案的正确性和接收者匿名性进行了证明.

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