In this paper, we explore graphical passwords as a child-friendly alternative for user authentication. We evaluate the usability of three variants of the PassTiles graphical password scheme for children, and explore the similarities and differences in performance and preferences between children and adults while using these schemes. Children were most successful at recalling passwords containing images of distinct objects. Both children and adults prefer graphical passwords to their existing schemes, but password memorization strategies differ considerably between the two groups. Based on our findings, we provide recommendations for designing more child-friendly authentication schemes.

According to a large MediaSmarts survey, 99 percent of Canadian children aged 8-15 are online. We already have a good number of security measures for adults but can those measures keep children secure as well? As a starting point, we explore the subject of user authentication for children.We conducted two studies on three graphical password schemes (Objects, Image and Words PassTiles), one with adults and one with children. We analyse the data collected from these 50 participants to compare their performance and preferences.Although outperformed by the adults, children performed best with Objects PassTiles where they recognized images of distinct objects from among decoys. Adults and children both have similar opinions, including a preference for graphical passwords over their existing password schemes. We conclude the thesis with four recommendations based on our experiences.ii

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