Kane et al. [17] discussed patterns and challenges of mobile
device use for people with visual impairments and briefly
mentioned users’ privacy concerns. The authors did not
delve into potential security problems. The study was conducted
in 2009, before the iPhone introduced VoiceOver2,
the built-in screen reader on iOS devices. Since blind people
now use touch screen devices, new security challenges
have arisen, which we focus on in this paper.
Some work has been done in the area of accessible security,
but, to our knowledge, none has focused on mobile devices. Kuber and Sharma proposed accessible authentication
methods for desktop computers using a tactile
mouse [19]. Several papers discussed the accessibility
of CAPTCHA’s [6, 12, 24], which are used to verify human
users, but do not protect against unauthorized access. Our
work concerns user authentication with accessible and secure
password techniques