Security Analysis and Enhancements of an Effective Biometric-Based Remote User Authentication Scheme Using Smart Cards

Table 1

Notations used in this paper.

Notation	Description
𝐶𝑖	User i
𝑅𝑖	Trusted registration centre i
𝑆𝑖	Server i
𝐴𝑖	Attacker i
PW𝑖	Password of the user i
ID𝑖	Identity of the user i
𝐵𝑖	Biometric template of the user i
h( )	A secure hash function
𝑋𝑠	A secret information maintained by the server
𝑥‖𝑦	x concatenates with y
𝑥⊕𝑦	Exclusive-OR operation of x and y