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Secure and efficient authentication protocols are necessary for cloud service. Multifactor authentication protocols taking advantage of smart card, user's password, and biometric, are more secure than password-based single-factor authentication protocols which are widely used in practice. However, most of the multiserver authentication protocols may have weak points, such as smart card loss attack, man-in-the-middle attack, anonymity, and high computation cost of authentication center. In orderdoi:10.1155/2018/5432960 fatcat:l5pxbmgfhbdpzmnrpl4nspzznq