“Multi-factor authentication needs multi-factor enrollment,” noted Taku. It shouldn’t have been possible to enroll just using a stolen password. He listed numerous possibilities, among them credentials handed out in person, a one-time password, or a PIN sent to the employee’s registered email or mobile.

Whereas U2F only supports multi-factor mode, having been designed to strengthen existing username/password-based login flows, FIDO2 adds support for single-factor mode.

Most platforms that require OTP verification for ensuring security are targeted at the mobile phone only. But some payment gaterways send OTP to email address also simultaneously to doubly ensure that you get the OTP and that you have requested the OTP. There could be some delay in SMS or email reaching you. Many OTPs are time restricted - you have to use them quickly.

We want to use the Doorkeeper gem to implement an OAuth provider in our app. However, we use 2 factor auth in the login process, so we need a way to modify the password grant to accept email, password and a 2fa token (and respond with an appropriate error if the 2fa token is required and missing).

me. We recommend using cloud-based TOTP apps such as: 1Password

Although it can be inconvenient, the two-factor authentication is the easiest and best way to keep your accounts from getting hacked. Whenever you log into an account from a new device, it will send an email or a text with a code that you input with your password.

Short of a fingerprint reader, two-step verification (aka two-step authorization) may be the single best way to protect online accounts.

2-Step Verification

If you're not already using 2-step verification, now is the time to enable it.

Two-factor authentication just shouldn't be optional anymore

This gives your users the option to increase the level of security to their account and help prevent unauthorized access.

Two-factor authentication, commonly abbreviated as 2FA, is any form of verification that requires two factors, like withdrawing money from an ATM using both a bank card and its PIN.