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Cryptanalysis of Zhou et al.'s user authentication protocol, the authors found that it was easily vulnerable to password guessing attack, user impersonation attack, privileged administrator attack and Dos attack if the attacker stole the legitimate user's smart card. Moreover, a key problem to design user authentication protocol for wireless sensor networks is to prolong the lifetime of the WSNs while guaranteeing the security. In this paper, they proposed a strong and efficient user authentication protocol for WSNs using smart card. Performance analysis shows that their proposed protocol is more secure against many popular attacks and achieves high efficiency.
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