Authentication protocols are sets of rules and standards that define how a user's identity is verified when accessing a system, application, or network. They are essential for ensuring that only authorized individuals gain access, protecting sensitive data and resources. Common examples include password-based authentication, multi-factor authentication (MFA), and certificate-based authentication. The protocols dictate the format of credentials, the exchange of messages between the user and the system, and the cryptographic algorithms used for secure verification. Popular authentication protocols include OAuth, OpenID Connect, SAML, and Kerberos.
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