Improved ECC-Based Three-Factor Multiserver Authentication Scheme

Table 2

Notations and descriptions.

Notations	Descriptions
	The registration center
	The j-th server
	The i-th user
	The attacker
	The public key of
	Hash function
	Biohash function
	User identity
	User’s password
	User’s biometrics
	Smart card
	Session key
	Concatenation
	Bitwise XOR
	Symmetric encryption/decryption algorithm with key