Several apps do this for multiple services, and they all function in similar fashion. Somewhere between the two methods stands a middle ground: Use an app on your mobile device to generate that one-time code. The most secure method today trusts a USB key that generates new codes when you lightly press your finger against it. The most basic (and least secure) of this method of securing accounts involves sending the one-time code over text message or email. It’s like using a debit card with a PIN, but the PIN, which changes each time, can be used with a wide range of services from companies including Google, Apple, Facebook,, Microsoft, PayPal, Slack, Twitter, Dropbox, Nintendo, and Twitch. ![]() Two-factor authentication, also known as 2FA, works in several ways, all of which result in delivering to the user a one-time, second password or passcode for accessing accounts. ![]() What the design itself does make clear is that when security-minded consumers upgrade their devices, they will have to take a few extra steps to migrate their two-factor authentication apps. ![]() Why the tech giant prematurely exposed its plans isn’t entirely clear. Last week, at least three months ahead of expectations, Google leaked the design for its upcoming Pixel 4 phone.
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