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Recently Manik et al. [13] proposed a novel remote user authentication scheme using bilinear pairings. Chou et al. [14] identified a weakness in Manik et al.'s scheme and made an improvement. Thulasi et al. [15] show that both Manik et al.'s and Chou et al.'s schemes are insecure against forgery attack and replay attack. But Thulasi et al. do not propose a(More)
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