CAPTCHA accessibility study of online forums

Kuzma, Joanne; Barnes, Sue; Oestreicher, Klaus

doi:10.1504/ijwbc.2011.041201

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…While many countries have developed their own legislations for accessibility, some developing countries do not have it protecting people with disability's rights [27]. Developing countries in Africa don't have stricter web accessibility legislations mandating governmental websites to be accessible [28]. In the case of Mozambique, the Mozambican government established a national ICT policy commission in 1998.…”

Section: 2mentioning

confidence: 99%

Web Accessibility and Web Developer Attitudes Towards Accessibility in Mozambique

Gupta

Gjøsæter

2021

Universal Access in Human-Computer Interaction. Design Methods and User Experience

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People with disabilities are found to be severely affected by barriers in websites and other web services. This paper aims to study the web accessibility issues in Mozambique and to review the factors that contribute to it. The case study is based on results from 2 perspectives: first, automatic evaluation of five prominent national websites, and second through fieldwork, interviewing and interacting with web developers in Mozambique. The study found that none of the websites are WCAG 2.1 compatible and the web developers, in general, do not consider web accessibility in their products and services. The underlying factors responsible for web inaccessibility are found out to be extrinsic.

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Section: 2mentioning

confidence: 99%

Web Accessibility and Web Developer Attitudes Towards Accessibility in Mozambique

Gupta

Gjøsæter

2021

Universal Access in Human-Computer Interaction. Design Methods and User Experience

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“…To assess the level of this latency increase, we designed a set of experiments taking into account both points 1 and 3, but leaving the latency component due to solving the CAPTCHA test (point 2) as it represents a human factor that has been studied extensively in the literature (eg, see the works of Bursztein et al, Yan and El Ahmad, and Kuzma et al).…”

Section: Performance Evaluationmentioning

confidence: 99%

ReCAP: A distributed CAPTCHA service at the edge of the network to handle server overload

Al-Hammouri

Al-Ali

Al-Duwairi

2017

Trans Emerging Tel Tech

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Web server overload resulting from an application layer–based distributed denial‐of‐service (DDoS) attack or a flash crowd event continues to be a major problem in today's internet because it renders the Web server unavailable in both cases. In this paper, we propose a novel system, called ReCAP, that handles server overload resulting from application layer–based DDoS attacks or flash crowd events. The system is envisioned as a service that can be provided to websites that have limited resources with no infrastructure in place to handle these events. The main goal of ReCAP is to filter attack traffic in case of a DDoS attack event and to provide users with basic information during a flash crowd event. The proposed system is composed of 2 main modules: (1) the HTTPredirect module, which is a stateless Hypertext Transfer Protocol server that redirects Web requests destined to the targeted Web server to the second module, and (2) the distributed Completely Automated Public Turing Test To Tell Computers and Humans Apart (CAPTCHA) service, which comprises a large number of powerful nodes geographically and suitably distributed in the internet acting as a large distributed firewall. All requests to the origin Web server are redirected to the CAPTCHA nodes, which can segregate legitimate clients from automated attacks by requiring them to solve a challenge. Upon successful response, legitimate clients (humans) are forwarded through a given CAPTCHA node to the Web server. These CAPTCHA proxies are envisioned to be placed intrinsically at the edge of the network in the proximity of the clients to curb communication delays, and thus perceived response times, and to relieve the core network from further traffic congestion. In particular, such organization fits squarely in the fifth use case scenario presented in the European Telecommunications Standards Institute Mobile Edge Computing Industry Specification Group's introductory technical paper on Mobile‐Edge Computing. In conclusion, the performance evaluation shows that the proposed system is able to mitigate application‐layer DDoS attacks while incurring acceptable delays for legitimate clients as a result of redirecting them to and via CAPTCHA nodes.

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Usability of CAPTCHA in Online Communities and Its Link to User Satisfaction

Swaid

2018

Encyclopedia of Information Science and Technology, Fourth Edition

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Completely Automated Public Turning Test to Tell Computers and Humans Apart (CAPTCHA) is a security mechanism that is used by online communities to block spam and hacking. Today, there are a large number of sophisticated CAPTCHAs that are robust, however, most of them are unusable. This chapter describes a study to examine types and characteristics of Text CAPTCHAs used by top 50 online communities. Furthermore, the study the first of its type to develop a scale to measure usability of text CAPTCHA and to examine the relationships between dimensions of CAPTCHA and perception of usability and satisfaction with registration process in online communities. Factor analysis and equation modeling study suggests that text-based CAPTCHA can be measured on four reflective dimensions of: (1) content; (2) visual layout; (3) distortion; and (4) service in which correlate significantly to users' sanctification with online community.

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CAPTCHA accessibility study of online forums

Cited by 4 publications

References 5 publications

Web Accessibility and Web Developer Attitudes Towards Accessibility in Mozambique

Web Accessibility and Web Developer Attitudes Towards Accessibility in Mozambique

ReCAP: A distributed CAPTCHA service at the edge of the network to handle server overload

Usability of CAPTCHA in Online Communities and Its Link to User Satisfaction

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