  Security questions are one of the techniques used in fall-back authentication
to retrieve forgotten passwords. This paper proposes a game design which aims
to improve usability of system-generated security questions. In our game
design, we adapted the popular picture-based "4 Pics 1 word" mobile game. This
game asks users to pick the word that relates the given pictures. We selected
this game because of its use of pictures and cues, in which, psychology
research has found to be important to help with memorability. The proposed game
design focuses on encoding information to users' long- term memory and to aide
memorability by using the follow- ing memory retrieval skills: (a) graphical
cues - by using images in each challenge; (b) verbal cues - by using verbal
descriptions as hints; (c) spatial cues - by keeping same or- der of pictures;
(d) interactivity - engaging nature of the game through the use of persuasive
technology principles.
