Summary: Evaluating Existing Audio CAPTCHAs and an Interface
Optimized for Non-Visual Use
Jeffrey P. Bigham and Anna C. Cavender
Department of Computer Science and Engineering
DUB Group
University of Washington
Seattle, WA 98195 USA
{jbigham, cavender}@cs.washington.edu
ABSTRACT
Audio CAPTCHAs were introduced as an accessible
alternative for those unable to use the more common
visual CAPTCHAs, but anecdotal accounts have sug-
gested that they may be more difficult to solve. This
paper demonstrates in a large study of more than 150
participants that existing audio CAPTCHAs are clearly
more difficult and time-consuming to complete as com-
pared to visual CAPTCHAs for both blind and sighted
users. In order to address this concern, we developed
and evaluated a new interface for solving CAPTCHAs
optimized for non-visual use that can be added in-place

Source: Anderson, Richard - Department of Computer Science and Engineering, University of Washington at Seattle

Collections: Computer Technologies and Information Sciences