Cryptanalysis of Li et al.'s proxy signature scheme

Authors:
Keon-Jik Lee;Byeong-Jik Lee
Affiliations:
Dept. of Electrical & Computer Eng., Kangwon National University, Chuncheon, Korea;Dept. of Computer Eng., Kyungpook National University, Daegu, Korea
Venue:
CONTROL'05 Proceedings of the 2005 WSEAS international conference on Dynamical systems and control
Year:
2005

Citing 4
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Abstract

This work shows that the security improvement of Li et al. for Park and Lee's nominative proxy signature scheme is still insecure against the original signer's forgery. The problem within Li et al. scheme is that the verifier cannot judge the correctness of the parameter generated by the original signer from the received signature.