What authentication protocols do you know?

Main authentication protocols:

• Basic Authentication — transmitting login and password in the HTTP header (not secure without HTTPS).
• Digest Authentication — a more secure version of Basic, uses hashing.
• OAuth 2.0 — an authorization protocol with access tokens, widely used for API access.
• OpenID Connect — an extension over OAuth 2.0 for user authentication.
• SAML (Security Assertion Markup Language) — exchanging authentication data between organizations, often in corporate systems.
• Kerberos — a network authentication protocol using tickets, common in corporate networks.
• JWT (JSON Web Token) — a token format for transmitting authentication information.

The choice of protocol depends on security requirements, system architecture, and use case scenarios.