This is a module for the Apache HTTP server, which allows you to use Google Authenticator's Two-Factor Authentication system (i.e. one-time passwords that change every 30 seconds), for user authentication.

See the Wiki for Explanation and instructions.

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If you're not familiar - Google Authenticator is a project which provides a two-factor authentication framework. It is used for services such as Google Apps and GMail, and can be used on Linux systems through an open source PAM module

Google Authenticator "Soft-Token" client applications are freely available on different mobile platforms:

• Google Authenticator for iPhone/iPad
• Google Authenticator for Android
• Blackberry