Mobile authentication methods protect smartphones from unauthorized access, but also require users to remember and frequently enter PINs, passwords, or graphical patterns. We propose the EmojiAuth scheme with which we study the effects of Emoji use on the usability and user experience of mobile authentication. We conducted two between-subjects studies (lab study: n=53; field study: n=41) comparing EmojiAuth to standard PIN entry. We find that Emo-jiAuth provides good memorability for short passwords and reasonable memorability for longer passwords. Moreover, we identify diverse Emoji-password selection strategies and provide insights on the practical security of Emoji-based mobile authentication. Our results suggest that Emoji-based authentication constitutes a practical alternative to traditional PIN authentication.

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We present a structured literature survey of User Experience (UX) dimensions and influencing factors in authentication research. The survey is based on authentication papers presented between 2010 and 2015 on the major human-computer interaction (HCI) and usable privacy and security (UPS) venues. 19% of the found papers include UX topics. Those papers show that there is a variety of ways how authentication research can profit from UX. Nevertheless, UX is often rather a by-product and not recognized as a field of study. We further discuss opportunities and challenges of including UX in authentication research.