CAPTCHA and Accessibility - Is This the Best We Can Do?

@inproceedings{Moreno2014CAPTCHAAA,
  title={CAPTCHA and Accessibility - Is This the Best We Can Do?},
  author={Lourdes Moreno and Mar{\'i}a Gonz{\'a}lez and Paloma Mart{\'i}nez},
  booktitle={WEBIST},
  year={2014}
}
Web access is affected by a great amount of accessibility issues that do not allow some users to access all information presented. Therefore, Web accessibility is an important issue because everybody should access Web content independently of their access features. Among these accessibility issues, a Web content element that interferes with Web accessibility is a CAPTCHA. A CAPTCHA is a challenge-response test used to determine whether or not the user is a human instead of a computer or a robot… 
4 Citations

Figures and Tables from this paper

HuMan: an accessible, polymorphic and personalized CAPTCHA interface with preemption feature tailored for persons with visual impairments

TLDR
The HuMan model has a CAPTCHA preemption feature which enables the user to stop the challenge audio as soon as the answer is identified, and the polymorphic nature of resolving the HuManCAPTCHA facilitates kaleidoscopic behavior in CAPTcha rendering.

WebAlly: Making Visual Task-based CAPTCHAs Transferable for People with Visual Impairments

TLDR
A proof-of-concept assistive transfer system — WEBALLY — that makes task-based CAPTCHAs transferable by allowing PVIs to source justin-time, remote control help from a trusted contact and the importance of complementing rather than replacing PVIs’ existing workflows is discussed.

Audio CAPTCHA Techniques: A Review

TLDR
This paper is an attempt to understand existing work and its accessibility in the arena of audioCAPTCHA and explores the obstacles in use of audio CAPTCHA.

Accessibility Challenges with CAPTCHA Services in Digital Libraries

TLDR
Security problems related to online digital libraries and portals are discussed and the approaches known under the abbreviation CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) are considered in the context of their accessibility to the users with different types of disabilities.

References

SHOWING 1-10 OF 14 REFERENCES

CAPTCHA accessibility study of online forums

TLDR
Analysis of 150-online forums shows that most sites use text-based CAPTCHAs, but rarely provide alternatives that would help users with visual disabilities, and presents alternatives that site designers may wish to consider in order to allow more disabled users to access their sites.

Accessibility of CAPTCHA methods

TLDR
Accessibility of different types of CAPTCHA for human users, especially visually impaired and elderly people are reviewed, and how easy are they for humans is reviewed.

A Survey and Analysis of Current CAPTCHA Approaches

TLDR
Current CAPTCHA and attacks against them are introduced; the robustness and usability of current CAPTCHAs are investigated and ideas to develop more robust and usable CAPT CHAs are discussed.

Evaluating existing audio CAPTCHAs and an interface optimized for non-visual use

TLDR
A new interface for solving CAPTCHAs optimized for non-visual use that can be added in-place to existing audio CAPT CHAs is developed and evaluated, illustrating a broadly applicable principle of accessible design: the most usable audio interfaces are often not direct translations of existing visual interfaces.

The SoundsRight CAPTCHA: an improved approach to audio human interaction proofs for blind users

TLDR
Evaluation results from three rounds of usability testing document that the task success rate was higher than 90% for blind users, and Discussion, limitations, and suggestions for future research are presented.

Accessible Voice CAPTCHAs for Internet Telephony

TLDR
This short note discusses the ongoing work on designing accessible voice CAPTCHAs for Internet Telephony, which has implemented a testbed for Skype to assess the usability, and conducted preliminary usability tests with 10 users.

Developing usable CAPTCHAs for blind users

TLDR
A new form of CAPTCHA that combines both visual and audio information to allow easy access by users with visual impairments is proposed and developed.

Web Content Accessibility Guidelines (WCAG) 2.0 – zasady i wytyczne do tworzenia dostępnych serwisów internetowych

TLDR
W jego strukturze zawiera się wiedza o sposobach interakcji osób z różnymi niepełnosprawnościami z informacją i intrfejsami, a jednocześnie bardzo logicznie zbudowany.

Making use: a design representation

Inaccessibility of CAPTCHA -Alternatives to Visual Turing Tests on the Web

  • W3C
  • 2005