A system and method for automatic authentication includes automatically calculating a security code on a computer running a security program. The security program resides on the same computer as a web browser. In response to a user signing into a web based account on a web site accessed by the web browser, automatically verifying that the security program is registered with the web based account. In response to a second factor security code entry request on the web based account, automatically entering the security code into the web based account. The security code is transmitted to the web site transparently to the user for login.