Challenge-Response

Challenge-response is a security method used to verify identities. When someone tries to access a system, it first sends a unique question (challenge). The user must then provide the correct answer (response), typically based on a shared secret or specific calculation. If the response matches what the system expects, access is granted. This process ensures that the person trying to access really has the right credentials, adding an extra layer of protection beyond just passwords. It’s like a secret handshake: the challenge tests the authenticity of the user before granting entry.