Seminar report on Graphical password, its uses and future scope was presented by Nirbhay Jha of 2011, CSE batch from SOE, CUSAT under the guidance of Sudheep Elayidom (HOD of CSE dpeartment).
Here is the abstract of what he presented in his seminar. To read more you can download its pdf version from here.
A graphical password is an authentication system that works by having the user select from images, in a specific order, presented in a graphical user interface (GUI). Graphical passwords may offer better security than text-based passwords because many people, in an attempt to memorize text-based passwords, use plain words (rather than the recommended jumble of characters).
A dictionary search can often hit on a password and allow a hacker to gain entry into a system in seconds. But if a series of selectable images is used on successive screen pages, and if there are many images on each page, a hacker must try every possible combination at random. If there are 100 images on each of the 8 pages in an 8-image password, there are 1008, or 10 quadrillion (10,000,000,000,000,000), possible combinations that could form the graphical password! If the system has a built-in delay of only 0.1 second following the selection of each image until the presentation of the next page, it would take (on average) millions of years to break into the system by hitting it with random image sequences.
You can read this presentation at slideshare too.