Abstract
Manik et al. [3] proposed a novel remote user authentication scheme using bilinear pairings. Recently, Fang et al [15] analyzed this schemeand pointed out that the proposed scheme is insecure. They proposed an improvement over this scheme. Further, Giri and Srivastava [16]observed that the improved scheme of Fang et al is still insecure against off-line attack and they suggested a new improved scheme. However,the improved scheme is still insecure. In this paper, we show some attacks on this scheme and propose an improved protocol that provides thebetter security as compared to the schemes previously discussed.
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