Chebyshev Polynomial-Based Authentication Scheme in Multiserver Environment

Table 4

Notations used in the scheme [19].

Notations	Description
U, S	User/patient, telecare server
PW, ID, B	Password/identity/biometrics of U
s	Private key of server
SK	Session key between U and S
h (.)	Cryptographic one-way hash function
Encx (.)/Decx (.)	Symmetric encryption scheme
Gen	Probabilistic generation algorithm
Rep	Probabilistic reproduction algorithm
⊕, ||, Tn	XOR, concatenation, Chebyshev operation