How do Two-factor authentication (2FA) work? Why does it not work for all online purchase transactions?
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Two factor authentication means that, in order to access a website, you need your password and a key texted to your phone(or a device that generates a one time password). The idea is, someone can steal your password pretty easily, but it’s harder for them to steal your password and your phone, so if you can prove a user has both of those things, it’s likely that they’re legitimate.
Not every website has a system set up to do this, so that’s why it doesn’t work everywhere.
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