Improved Chebyshev Polynomials-Based Authentication Scheme in Client-Server Environment

Table 2

The security feature comparison among the schemes.

Kinds of attack	Lin[23]	Zhu[24]	Ours
Password-guessing	✘	✔	✔
Replay	⌀^1	✔	✔
User anonymity	✔	⌀	✔
Impersonation	✔	✔	✔
Man-in-the-middle	⌀	⌀	✔
Parallel	⌀	⌀	✔
Two-factor	✘	✔	✔
Perfect secrecy session key	⌀	✘	✔

The authors do not consider.