International Association for Cryptologic Research

International Association
for Cryptologic Research


Paper: Cryptanalysis of Lee-Hwang-Li's Key Authentication Scheme

Fangguo Zhang
Kwangjo Kim
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Abstract: Key authentication is very important in secret communications and data security. Recently, Lee, Hwang and Li proposed a new public key authentication scheme for cryptosystems with a trusty server. However, in this paper, we will show that Lee-Hwang-Li's key authentication scheme is not secure, from the obtained public information, any one can get the private key of the user. And then, we propose an improved scheme. We conclude that our new key authentication scheme not only resolves the problems appeared but also is secure.
  title={Cryptanalysis of Lee-Hwang-Li's Key Authentication Scheme},
  booktitle={IACR Eprint archive},
  keywords={Key authentication scheme, Cryptanalysis, Certificate, Password.},
  note={ 12123 received 21 Jan 2003, last revised 12 Mar 2003},
  author={Fangguo Zhang and Kwangjo Kim},