Vidoop is a new online web service that replaces passwords with random pictures/photos on supported OpenID websites for single sign on (via). Vidoop secures your credentials against keystroke logging, phishing, password guessing, brute force, and other types of hacking schemes. Apart from OpenId, you would be able to implement photo based password authentication on your own website in the future.

When you want to sign on to a Vidoop-protected site, you’re shown a grid of pictures, each of which has a letter stamped on top of it. You need to select the pictures in the categories that you’ve selected as your password.

For example, if you’ve selected a car, boat, plane as your password, then you need to find the pictures of the car, the boat, and the plane in the grid, and enter in the letter on top of each one of them. Each time you visit a site to log in, the pictures change. The “airplane” one time may be a fighter jet, the next time a Boeing 747. The pictures’ positions changes in the grid, too. And the letters that go with the proper pictures also change. This makes the password very difficult to hack.

The service is currently in a closed invite only Beta.