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Liip Blog:
2-step verification with Google Authenticator and PHP
August 08, 2012 @ 13:12:01

With the recent focus on security (caused by some major issues with large companies) Google has responded by reinforcing their 2-Factor Authentication method. Thankfully, there's a way you can implement that functionality in your applications too using the information in this tutorial (note: the date of posting is older, but it's definitely relevant now).

Many large web services nowadays support 2-step verification to enhance the security for their users. [...] The main point about 2-step verification is that something else than your computer provides that token. If it's on your computer and that one gets stolen (or hacked into), it won't help much for the additional security. That's why you need a second device for those tokens.

They link to this library that can help you implement something similar to Google's Authenticator tool for your application.

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google authenticator twostep verification library


Liip Blog:
2-Step Verification with Google Authenticator and PHP
August 31, 2011 @ 09:53:05

On the Liip blog there's a recent post talking about a tool Google offers to help you authenticate your users, a one-time passcode generator called Google Authenticator. The post talks about a PHP port of the same idea.

The main point about 2-step verification is that something else than your computer provides that token. If it's on your computer and that one gets stolen (or hacked into), it won't help much for the additional security. That's why you need a second device for those tokens. Some banks do that with SMS/Text Messages (Facebook, too), other give you special devices for that (eg. RSA keys) and the last group does it with your smartphone.

At the request of a client, they created a tool that did just this, but for PHP. As a result, they created the GoogleAuthenticator library that makes it easy to implement in your application. There's even an example of it in use. For more information about the Google Authenticator tool, see this page on Google Code.

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google authenticator library port twostep verification user qrcode



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