A Secure Three-Factor Multiserver Authentication Protocol against the Honest-But-Curious Servers

Table 1

Symbols and notations in Wang et al.’s scheme.

	the th user
	the th server
	registration centre
	’s identity
	’s dynamic identity
	’s identity
	’s smart card
	’s password
	’s biometrics
	’s nearly random binary string
	pre-shared key between server and registration centre
	master secret key between user and registration centre
	exclusive OR
	one-way hash function
	concatenating operation