Duo passwordless authentication is part of Cisco’s zero trust platform, securing access for any user, from any device, to any IT application or environment. The product is designed to be infrastructure agnostic, paving the way to a passwordless future while ensuring that enterprises can seamlessly protect any combination of cloud and on-premises applications without requiring multiple authentication products or leaving critical security gaps. Duo Passwordless authentication leverages the Web Authentication (WebAuthn) standard, based in asymmetric cryptography, enabling biometrics to be securely stored on and validated by the device, locally.
Source: https://www.helpnetsecurity.com/2021/04/01/cisco-duo-passwordless-authentication/