@Override
    public List<String> getSource() {
        return List.of("Duo Security");
    }
This is {@link DuoSecurityMultifactorAuthenticationDeviceManager}.

@author Misagh Moayyed
@since 7.1.0
support/cas-server-support-duo-core/src/main/java/org/apereo/cas/adaptors/duo/authn/DuoSecurityMultifactorAuthenticationDeviceManager.java