Abstract
In this paper an efficient user identification scheme based on ID-based cryptosystem is discussed. In this paper, it is indicated that Hwang et al., scheme is vulnerable to the forgery attack. And also improved scheme is quite similar to Hwang et al's scheme; the modified scheme is secure against the attack. The time complexity of computing the parameter a requires just one more modular multiplication operation. Thus, the scheme is not only far more secure but also efficient than Hwang et al's.
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