Here is another graphical password scheme. This one appears to use a complicated collection of categories, images, and letters. As with other schemes, it is not clear how usable the system will be. Most problematic are confusion problems that may arise if people use the system for more and more accounts. Very little research has been done on confusions with graphical passwords.
New ‘passwordless’ authentication technology debuts at Web 2.0 Expo
At the time of login, users are presented with an array of images including an airplane, a car, or a key, and several other unrelated images. Each images has a letter stamped on top of it. To successfully login, user has to select the images in the categories that he/she selected as password. For example, if you’ve selected airplane, car, key as password, then you need to find the images of the airplane, the car, and the key in the grid, and enter in the letter on top of each one of them. Each time you try to log in, the images change. The “car” one time may be a mercedes bench, the next time a Ferrari. The images position changes in the grid, too. And the letters that go with the proper images also change. This makes the password very difficult to hack. Since other observers do not know the user’s categories, they do not know which of the displayed access codes to use as the key. Only the user can interpret the grid and notices a series of digits that act as the one-time access code.