通信学报

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对一个基于身份签密方案的分析与改

张 宇,杜瑞颖,陈 晶,侯 健,周 庆,王文武   

  1. 1. 武汉大学 计算机学院,湖北 武汉 430072;2. 信息保障技术重点实验室,北京 100072;3. 总参陆航研究所,北京101121
  • 出版日期:2015-11-27 发布日期:2015-11-27
  • 基金资助:
    信息保障技术重点实验室开放基金资助项目(KJ-13-104)

Analysis and improvement of an identity-based signcryption

  • Online:2015-11-27 Published:2015-11-27

摘要: 基于身份的签密方案计算开销小,密钥管理简单,适用于保证信息的保密性和认证性。Zhang等提出了一个高效的基于身份签密方案,并在随机预言模型下证明了该方案的安全性。通过分析发现Zhang等的签密方案存在缺陷,针对缺陷提出了相应的改进方案,并且基于随机预言模型证明了新方案的安全性。理论分析和实验仿真证明,所提方案计算复杂度低,适合于实际应用。

关键词: 基于身份的签密;可证明安全;双线性对;随机预言模型

Abstract: Identity-based signcryption was a cryptography scheme with low computation cost and simple key management, which was suitable to guarantee the confidentiality and authentication of information. Zhang, et al proposed an efficient identity-based signcryption scheme, and provided security provement in the random oracle model. Through analysis, it was found out that Zhang’s signcryption scheme was imperfect. To avoid the defect, a new identity-based signcryption scheme was proposed, whose security was proved in the random orcale model. Both the theoretical analysis and the experimental results show that proposed scheme is efficient and suitable for practical application.

Key words: identity-based signcryption; provable security; bilinear pairing; random oracle model

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