PHONEFACTOR

After its acquisition by Microsoft, PhoneFactor became Windows Azure Multi-Factor Authentication. PhoneFactor provides tokenless two-factor authentication using phones. After you log in with your username and password, you receive a phone call to your pre-registered phone number asking you to confirm the login attempt. You press # to confirm the login, and you're in. If a bad guy steals your username and password and tries to use them to log in, *your* phone will ring, so he won't get in. ... The product is available in both Enterprise and Web versions. The Enterprise version integrates into a range common enterprise environments, including Citrix, Microsoft Windows, RADIUS infrastructures, IIS-based websites, and more. The Web edition is delivered in the form of an SDK in several programming languages, and can be used to add built-in support for PhoneFactor to your application.More