Is authentication useful? As shown, choosing an authentication method entails several factors.

Please elaborate so I may learn more about authentication challenge response systems. In contrast to what has been shown here, a system in which users are responsible for remembering passwords is very insecure.

In an authentication system that employs both private and public keys, who should have access to a private key?

It is recommended to combine public-key cryptography with other asymmetric encryption strategies. In cryptography, public keys are used.

Explain "multifactor authentication". Does it protect passwords?

In an authentication system that employs both private and public keys, who should have access to a private key?

An authentication challenge–response system may be described. Why is this approach more secure than a password-based method?

Master of Fine Arts degrees are something I've always been interested in but never took the time to research. If someone other than the person for whom it was intended is able to decrypt a password, then the value of the password will drop.

Bottom-up security is inferior than top-down security.

In an authentication system that employs both private and public keys, who should have access to a private key?