Krol, K;
Parkin, S;
Sasse, MA;
(2016)
Better the Devil You Know: A User Study of Two CAPTCHAs and a Possible Replacement.
In:
Proceedings of NDSS Workshop on Usable Security (USEC 2016).
Internet Society: San Diego, CA, USA.
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Abstract
CAPTCHAs are difficult for humans to use, causing frustration. Alternatives have been proposed, but user studies equate usability to solvability. We consider the user perspective to include workload and context of use. We assess traditional text-based CAPTCHAs alongside PlayThru, a 'gamified' verification mechanism, and NoBot, which uses face biometrics. A total of 87 participants were tasked with ticket-buying across three conditions: (1) all three mechanisms in comparison, and NoBot three times (2) on a laptop, and (3) on a tablet. A range of quantitative and qualitative measurements explored the user perspective. Quantitative results showed that participants completed reCAPTCHAs quickest, followed by PlayThru and NoBot. Participants were critical of NoBot in comparison but praised it in isolation. Despite reporting negative experiences with reCAPTCHAs, they were the preferred mechanism, due to familiarity and a sense of security and control. Although slower, participants praised NoBot's completion speeds, but regarded using personal images as invading privacy.
| Type: | Proceedings paper |
|---|---|
| Title: | Better the Devil You Know: A User Study of Two CAPTCHAs and a Possible Replacement |
| Event: | USEC 2016 : NDSS Workshop on Usable Security |
| Location: | San Diego, CA (USA) |
| Dates: | 21 February 2016 - 21 February 2016 |
| ISBN: | 1891562428 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.14722/usec.2016.23013 |
| Publisher version: | https://www.internetsociety.org/sites/default/file... |
| Language: | English |
| Additional information: | Permission to freely reproduce all or part of this paper for noncommercial purposes is granted provided that copies bear this notice and the full citation on the first page. Reproduction for commercial purposes is strictly prohibited without the prior written consent of the Internet Society, the first-named author (for reproduction of an entire paper only), and the author’s employer if the paper was prepared within the scope of employment. USEC ’16, 21 February 2016, San Diego, CA, USA Copyright 2016 Internet Society, ISBN 1-891562-42-8 http://dx.doi.org/10.14722/usec.2016.23013 |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Computer Science |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1535331 |
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