Challenge Response Model

The Challenge-Response Model is a security process used to verify identities. When someone tries to access a system, the system sends a unique "challenge"—like a question or puzzle—that only the authorized user can solve or respond to correctly. If the response matches what’s expected, access is granted. This method ensures that even if someone’s credentials are known, they can’t access the system without correctly answering the challenge, adding an extra layer of security beyond just passwords.