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

Table 2

Notations in the new protocol.

	th user and th server
	the registration centre
	’s identity, dynamic identity and ’s identity
	’s smart card, password and biometrics
	valid biometric characteristic extracted from
	master secret key between server and registration centre
	master secret key between user and registration centre
	hash function, XOR operation and concatenating operation
	pre-shared key between and registration centre
	pre-shared key between and registration centre