OpenCart also has a Google Authenticator plugin. The Google Authenticator
is available for Android, Blackberry, and iOS. This will make the admin
login like the login at your bank, where you have to enter a few numbers
either sent on sms message, or generated by some small device. Unless there
is a critical flaw in OpenCart people will not be able to login to admin
without access to your phone as well.
http://www.opencart.com/index.php?route=extension/extension/info&extension_id=7956
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My PGP is available at:
http://downgoat.net/contact/
