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Key Replacement Attack Against a Generic Construction of Certificateless Signature

  • Bessie C. Hu
  • Duncan S. Wong
  • Zhenfeng Zhang
  • Xiaotie Deng
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4058)

Abstract

Certificateless cryptography involves a Key Generation Center (KGC) which issues a partial key to a user and the user also independently generates an additional public/secret key pair in such a way that the KGC who knows only the partial key but not the additional secret key is not able to do any cryptographic operation on behalf of the user; and a third party who replaces the public/secret key pair but does not know the partial key cannot do any cryptographic operation as the user either. We call this attack launched by the third party as the key replacement attack. In ACISP 2004, Yum and Lee proposed a generic construction of digital signature schemes under the framework of certificateless cryptography. In this paper, we show that their generic construction is insecure against key replacement attack. In particular, we show that the security requirements of their generic building blocks are insufficient to support some security claim stated in their paper. We then propose a modification of their scheme and show its security in a new and simplified security model. We show that our simplified definition and adversarial model not only capture all the distinct features of certificateless signature but are also more versatile when compared with all the comparable ones. We believe that the model itself is of independent interest.

Keywords

Signature Scheme Cryptographic Operation Digital Signature Scheme Adversarial Model Signature Generation Algorithm 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2006

Authors and Affiliations

  • Bessie C. Hu
    • 1
  • Duncan S. Wong
    • 1
  • Zhenfeng Zhang
    • 2
  • Xiaotie Deng
    • 1
  1. 1.Department of Computer ScienceCity University of Hong KongHong KongChina
  2. 2.State Key Laboratory of Information SecurityInstitute of Software, Chinese Academy of SciencesBeijingChina

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