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中国科学院大学学报 ›› 2008, Vol. 25 ›› Issue (3): 395-402.DOI: 10.7523/j.issn.2095-6134.2008.3.015

• 论文 • 上一篇    下一篇

一个具有强安全性的多接收者签密方案

朱珍超1,2,张玉清2,王凤娇2   

  1. 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
  • 收稿日期:1900-01-01 修回日期:1900-01-01 发布日期:2008-05-15

A Multi-Recipient Signcryption Scheme of Strong Security

ZHU Zhen-chao1,2,ZHANG Yu-qing 2,WANG Feng-jiao2   

  1. 1. Communication Engineering Institute,Xidian University,Xi’an 710071, China;
    2. National Computer Network Intrusion Protection Center, GUCAS, Beijing 100049, China
  • Received:1900-01-01 Revised:1900-01-01 Published:2008-05-15

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。

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

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.

Key words: Multi-Recipient Signcryption Schem, random oracle, Bilinear Pairings, ciphertext Anonymity