| 一个具有强安全性的多接收者签密方案 |
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| 作者姓名： | 朱珍超 张玉清 王凤娇 |
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| 作者单位： | 1.西安电子科技大学通信工程学院，西安 710071 ;2.中国科学院研究生院国家计算机网络入侵防范中心，北京 100043; |
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| 摘 要： | 在随机预言模型下定义了一个多接收者签密方案的强安全性模型，该模型满足适应性选择密文内部攻击安全性、选择消息抗存在性伪造和密文匿名安全性；通过分析指出, Li、Hu和Liu等人提出的多接收者签密方案, 不具有适应性选择密文内部攻击安全性和密文匿名性，并给出所定义强安全性模型中的攻击方法；随后提出改进方案，该方案在强安全模型中证明是安全的。
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| 关 键 词： | 多接收者签密体制 随机预言机模型 双线性对 密文匿名性 |
A Multi-Recipient Signcryption Scheme of Strong Security |
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| Authors: | ZHU Zhen-chao ZHANG Yu-qing WANG Feng-jiao |
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| Institution: | 1. Communication Engineering Institute，Xidian University，Xi’an 710071, China;2. National Computer Network Intrusion Protection Center, GUCAS, Beijing 100049, China ; |
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| Abstract: | This paper defines a strong security model for multi-recipient signcryption scheme in the random oracle model, which is semantically secure against adaptive chosen-ciphertext insider attack, existentially forgeable chosen-message attack and anonymous chosen-ciphertext insider attack. By analyzing, we point out that Li-Hu-Liu Multi-Recipient Signcryption Scheme is insecure against the adaptive and anonymous chosen-ciphertext insider attacks. Later, we present an improved scheme, which is proven to be secure in our newly defined strong security model. |
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| Keywords: | Multi-Recipient Signcryption Schem random oracle Bilinear Pairings ciphertext Anonymity |
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