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I remember a while back when I used imdb or google apps, I had to enter my phone number and subsequently was texted a short ~5 character code to enter in their online form. The value I entered in that field was authenticated against the code they texted me.

I wanted to implement that same technology in a web app I'm making.

Are there any one-time message sms authentication services out there?

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SMS confirmation is one form of two-factor authentication. Here are two providers who offer such a service:

You could also consider a two-factor authentication service that doesn't rely on SMS, but instead depends on something else the user has in their possession, like a hardware token or an iPhone/Android device with a special authenticator app installed. DuoSecurity offer this service, as do Wikid and Google Authenticator.

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