Modern systems need speed, security, and scale. Password-based logins fail on all three. They breed credential stuffing, phishing, and reset loops that waste hours and expose data. Passwordless authentication removes the weak link. With SSO, it collapses the identity process into one secure workflow across all apps.
Passwordless SSO uses cryptographic methods like WebAuthn, magic links, or hardware keys to verify users without storing secrets that can be stolen. Combined with an identity provider (IdP), authentication happens once, then propagates through all authorized systems. No more repeated logins. No more shared passwords in spreadsheets.
The architecture is straightforward. A user signs in through the IdP using a passwordless method. The IdP issues a secure token via OpenID Connect or SAML. Each connected service checks this token with minimal overhead. This cuts attack surface while making authentication almost invisible to end users.