Authentication and Authorization, Explained: One Map from Passwords to Passkeys, OAuth, and Zero Trust
Authentication (who you are) and authorization (what you may do), explained as one connected map — from passwords, MFA, and passkeys to SSO, OAuth, OIDC, and SAML, up to Zero Trust. A concept guide for US/EU builders, centered on NIST SP 800-63-4 and eIDAS 2.0.
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