Google Authenticator works with 2-step verification for your Google Account to provide an additional layer of security when signing in. Use Google Authenticator to generate verification codes directly on your phone, without the need for a network connection.
-Automatic setup via QR code
-Support for multiple accounts
-Support for time-based and counter-based code generation
To use Google Authenticator, you need to enable 2-step verification on your Google Account.
Requires iOS 4.0 or later.