This is an authentication method in which is used to prove that a party knows a password without transmitting the password in any recoverable form over a network. This authentication is secure because the password is never transmitted over the network, even in hashed form; only a random number and an encrypted random number are sent.

A.
Realm Authentication

B.
SSL Authentication

C.
Basic Form Authentication

D.
Challenge/Response Authentication

E.
Cryptographic Authentication