Chebyshev Polynomial-Based Authentication Scheme in Multiserver Environment

Table 2

Notations used in the scheme [12].

Notations	Description
S, U, (qS, QS)	Server/user, key-pair of S
IDU, PWU	Identity and password of U
H1	Hash function {0, 1} ⟶
H2	Hash function  ×  ⟶
H3|	Hash function {0, 1} ×  ×  ⟶ {0, 1}^k
rU, rS	Secret values of U and S
, EP ()	Finite field, elliptic curve defined over
	Group of points in EP (),  = n ∈ ℙ
P	Base point P is a generator of