It might be more convenient, but is less secure. Many services use SMS OTP as a second form of authentication. Industry standard algorithms such as SHA-1 generate OTPs with a shared secret and a moving factor. It is therefore also resistant to replay attacks since one OTP is only tied to one session. OTPs are generated with algorithms generating random numbers.
The user receives an SMS or a voice call with their One Time Password.
Generally a combination of username/password and a second authentication factor is used to authenticate the user to the service.Ĭommon 2FA authentication methods include:īiometric (Fingerprint, Retina pattern, facial recognition)įIDO U2F - Fast Identity Online Universal Second Factor So, even if your password is stolen or your phone is lost, it is highly unlikely for the attacker to gain access to your account. With 2FA, a compromise of one of these factors will not provide access to the account. Two-factor authentication (2FA) is an authentication method where the user is granted access only after successfully authenticating oneself via two mechanisms.
