by Chris Hoffman
on How to geek
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Published on Sun, 18 Nov 2012 11:00:04 GMT Indexed on 2012/11/18 17:07 UTC
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Google, Dropbox, LastPass, Battle.net, Guild Wars 2 – all these services and more offer two-factor authentication apps that work on smartphones. If you don’t have a supported device, you can run an alternative application on your computer.
When you log in, you’ll need to enter a time-based code from the app. Two-factor authentication prevents people who know your password – but don’t have the app and its security key – from logging in.
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