Malicious KGC attacks in certificateless cryptography

Research output: Chapters, Conference Papers, Creative and Literary Works (RGC: 12, 32, 41, 45)32_Refereed conference paper (with ISBN/ISSN)peer-review

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Author(s)

  • Man Ho Au
  • Jing Chen
  • Joseph K. Liu
  • Yi Mu
  • Duncan S. Wong
  • And 1 others
  • Guomin Yang

Related Research Unit(s)

Detail(s)

Original languageEnglish
Title of host publicationeProceedings of the 2nd ACM Symposium on Information, Computer and Communications Security, ASIACCS '07
Pages302-311
Publication statusPublished - 2007

Conference

Title2nd ACM Symposium on Information, Computer and Communications Security, ASIACCS '07
PlaceSingapore
CitySingapore
Period20 - 22 March 2007

Abstract

Identity-based cryptosystems have an inherent key escrow issue, that is, the Key Generation Center (KGC) always knows user secret key. If the KGC is malicious, it can always impersonate the user. Certificateless cryptography, introduced by Al-Riyami and Paterson in 2003, is intended to solve this problem. However, in all the previously proposed certificateless schemes, it is always assumed that the malicious KGC starts launching attacks (so-called Type II attacks) only after it has generated a master public/secret key pair honestly. In this paper, we propose new security models that remove this assumption for both certificateless signature and encryption schemes. Under the new models, we show that a class of certificateless encryption and signature schemes proposed previously are insecure. These schemes still suffer from the key escrow problem. On the other side, we also give new proofs to show that there are two generic constructions, one for certificateless signature and the other for certificateless encryption, proposed recently that are secure under our new models. Copyright 2007 ACM.

Citation Format(s)

Malicious KGC attacks in certificateless cryptography. / Au, Man Ho; Chen, Jing; Liu, Joseph K.; Mu, Yi; Wong, Duncan S.; Yang, Guomin.

eProceedings of the 2nd ACM Symposium on Information, Computer and Communications Security, ASIACCS '07. 2007. p. 302-311.

Research output: Chapters, Conference Papers, Creative and Literary Works (RGC: 12, 32, 41, 45)32_Refereed conference paper (with ISBN/ISSN)peer-review