Challenge-response authentication

wikipedia:Challenge–response authentication

• zero-knowledge password proof (ZKPP)
• Challenge-Handshake Authentication Protocol (CHAP)
• CRAM-MD5
• ssh's challenge-response system based on RSA

See also

• SCRAM
• Authentication, AAA, MFA, OpenID, OAuth, OATH, PAM, Personal access token, CWE: Broken Access Control, PAT, Mutual authentication, Federated authentication, IdP, Amazon Cognito, Phone to sign in, Firebase Authentication, Auth0, WebAuthn, Web3auth, Challenge-response