The Usability of CAPTCHAs on Smartphones

Gerardo Reynaga, Sonia Chiasson

2013

Abstract

Completely Automated Public Turing tests to tell Computers and Humans Apart (CAPTCHA) are challenge-response tests used on the web to distinguish human users from automated bots (von Ahn et al., 2004). In this paper, we present an exploratory analysis of the results obtained from a user study and a heuristic evaluation of captchas on smartphones; we aimed to identify opportunities and guide improvements for captchas on smartphones. Results showed that existing captcha schemes face effectiveness and user satisfaction problems. Among the more severe problems found were the need to often zoom and pan, and too small control buttons. Based on our results, we present deployment and design guidelines for captchas on smartphones.

Paper Citation

in Harvard Style

Reynaga G. and Chiasson S. (2013). The Usability of CAPTCHAs on Smartphones . In Proceedings of the 10th International Conference on Security and Cryptography - Volume 1: SECRYPT, (ICETE 2013) ISBN 978-989-8565-73-0, pages 427-434. DOI: 10.5220/0004533904270434

in Bibtex Style

@conference{secrypt13,
author={Gerardo Reynaga and Sonia Chiasson},
title={The Usability of CAPTCHAs on Smartphones},
booktitle={Proceedings of the 10th International Conference on Security and Cryptography - Volume 1: SECRYPT, (ICETE 2013)},
year={2013},
pages={427-434},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0004533904270434},
isbn={978-989-8565-73-0},
}

in EndNote Style

TY - CONF
JO - Proceedings of the 10th International Conference on Security and Cryptography - Volume 1: SECRYPT, (ICETE 2013)
TI - The Usability of CAPTCHAs on Smartphones
SN - 978-989-8565-73-0
AU - Reynaga G.
AU - Chiasson S.
PY - 2013
SP - 427
EP - 434
DO - 10.5220/0004533904270434