Google Authenticator App
Google is introducing a two-step authentication process for Google Apps users. If enabled by a Google Apps administrator, Google Apps Premiere, Government and Education edition users have the option of receiving an SMS message or voice call on their mobile phones with a login verification code. Users of Android, BlackBerry and (soon) iPhone devices also have the option of downloading a mobile app called Google Authenticator that can generate a login verification code without the need for network access.
Google plans to open-source the code for these mobile applications to allow third parties to adapt them to specific enterprise security needs, such as integration with an existing on-premises authentication system.
Related:
Google Apps Adds Two-Step Verification
