Number Verification and Two Factor Authentication in Ruby on Rails
More and more websites and apps rely on knowing your phone number and in many cases using that number for two factor authentication.
In this tutorial you will learn how to build your own two factor system in about 30 minutes. In part 2 you will implement it in an Android app, and it part 3, you will implement is as part of the login process in a rails app.
The full tutorial can be seen here.
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