Authentification Guide — Two authenticators
Web Authentication: An API for accessing Public Key Credentials - Level 2
Two-Factor Authentication with Keycloak WebAuth · Ultimate Security Professional Blog
FIDO2: Authenticate easily with phishing-resistant security - Help Net Security
Types of two-factor authentication, pros and cons: SMS, authenticator apps, YubiKey
Two-Factor Authentication with Keycloak WebAuth · Ultimate Security Professional Blog
Facebook two-factor auth
The Definitive Guide to 2 Factor Authentication - by Arsen
Client to Authenticator Protocol (CTAP)
Two-Factor Authentication with Keycloak WebAuth · Ultimate Security Professional Blog
Web Authentication: An API for accessing Public Key Credentials - Level 2
RightSignature- Mandatory enforcement of Two-factor authentication