Authentication Method Reference Name,Authentication Method Reference Description,Change Controller,Reference face,Facial recognition,[IESG],"[RFC8176, Section 2]" fpt,Fingerprint biometric,[IESG],"[RFC8176, Section 2]" geo,Geolocation,[IESG],"[RFC8176, Section 2]" hwk,Proof-of-possession of a hardware-secured key,[IESG],"[RFC8176, Section 2]" iris,Iris scan biometric,[IESG],"[RFC8176, Section 2]" kba,Knowledge-based authentication,[IESG],"[RFC8176, Section 2]" mca,Multiple-channel authentication,[IESG],"[RFC8176, Section 2]" mfa,Multiple-factor authentication,[IESG],"[RFC8176, Section 2]" otp,One-time password,[IESG],"[RFC8176, Section 2]" pin,Personal Identification Number or pattern,[IESG],"[RFC8176, Section 2]" pop,Proof-of-possession of a key,[OpenID_Foundation_Enhanced_Authentication_Profile_Working_Group],[OpenID Connect Extended Authentication Profile (EAP) ACR Values 1.0] pwd,Password-based authentication,[IESG],"[RFC8176, Section 2]" rba,Risk-based authentication,[IESG],"[RFC8176, Section 2]" retina,Retina scan biometric,[IESG],"[RFC8176, Section 2]" sc,Smart card,[IESG],"[RFC8176, Section 2]" sms,Confirmation using SMS,[IESG],"[RFC8176, Section 2]" swk,Proof-of-possession of a software-secured key,[IESG],"[RFC8176, Section 2]" tel,Confirmation by telephone call,[IESG],"[RFC8176, Section 2]" user,User presence test,[IESG],"[RFC8176, Section 2]" vbm,Voice biometric,[IESG],"[RFC8176, Section 2]" wia,Windows integrated authentication,[IESG],"[RFC8176, Section 2]"