PassPositions: A secure and user-friendly graphical password scheme

To solve the problem of text-based password authentication, graphical passwords using images have evolved. Graphical passwords process authentication by selecting the exact positions on the image shown on the screen. These conventional graphical password schemes cannot be used for recognition if the correct points on the screen cannot be selected in the same order. To solve this problem, a new graphical password scheme called PassPositions was introduced. PassPositions were designed based on universal design, so it is user-friendly for everyone, regardless of their physical abilities. However, in certain cases, PassPositions does have some weak points. In this paper will identify a problem of PassPositions, and improve the PassPositions.