Chebyshev Polynomial-Based Authentication Scheme in Multiserver Environment

Table 3

Notations used in the scheme [13].

Notations	Description
Ui, S	i^th user, medical centre
PWi, IDi, Bi	Password/identity/biometrics of Ui
p, q,	Two prime numbers, finite field
EP ()	EC in : y^2 = x^3 + ax + b (a, b ∈ ) and δ = 4a^3 + 27 b^2 ≠ 0
	Group of points in EP ()
P	Base point of with prime order q
aP	Point multiplication P
x	Secret key of S (1024 bit)
	Multiplicative group
h (.)	Hash function {0, 1} ⟶
H (.)	Biohashing
h1 (.)	Hash function  ×  ⟶
⊕, ||, ENC/DEC	XOR, concatenation, encrypt/decrypt