Cryptology ePrint Archive: Report 2003/011
Cryptanalysis of Lee-Hwang-Li's Key Authentication Scheme
Fangguo Zhang and Kwangjo Kim
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.
Category / Keywords: Key authentication scheme, Cryptanalysis, Certificate, Password.
Date: received 21 Jan 2003, last revised 12 Mar 2003
Contact author: zhfg at icu ac kr
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Version: 20030312:085934 (All versions of this report)
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