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

Available format(s): Postscript (PS) | Compressed Postscript (PS.GZ) | PDF | BibTeX Citation

Version: 20030312:085934 (All versions of this report)

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