Accessible Two-Factor Authentication Using Voice and Touch CAPTCHA
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Solution Overview
Problem
Traditional CAPTCHAs pose significant accessibility challenges for blind or disabled users, particularly those with visual impairments, preventing them from securely accessing online services and creating barriers in personal and professional environments.
Innovation Solution
Implementing alternative CAPTCHA services through Unstructured Supplementary Service Data (USSD) sessions and voice calls, allowing users to opt for touch-based challenges or audio instructions, ensuring secure and accessible Two-Factor Authentication (2FA) processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional visual CAPTCHAs are used for 2FA, then security effectiveness is improved, but accessibility for blind or disabled users deteriorates
Solution Approach 1:
The system dynamically adapts the CAPTCHA type based on user characteristics. It detects whether a user has visual impairments and automatically switches from visual CAPTCHAs to alternative forms such as audio-based or touch-based CAPTCHAs, making the authentication process accessible while maintaining security effectiveness
Solution Approach 2:
The system changes the modality parameter of the CAPTCHA from visual to auditory or tactile forms. By altering the sensory channel required for completion, the system enables blind or disabled users to authenticate successfully without compromising the security function
2Ease of operation
If alternative CAPTCHA services are offered, then accessibility for disabled users is improved, but system complexity increases
Solution Approach 1:
The authentication system is designed to handle multiple CAPTCHA types through a unified framework. The same system infrastructure supports visual, audio, and touch-based CAPTCHAs, allowing it to serve diverse user needs without requiring separate independent systems for each accessibility requirement
Solution Approach 2:
The system introduces an intermediary layer that detects user characteristics and selects appropriate CAPTCHA types. This mediator component simplifies the overall architecture by centralizing the decision-making logic for accessibility adaptation, rather than requiring complex parallel processing paths for each user type
Data Source
AI summary
Embodiments of the present disclosure are directed to systems and methods for enhancing accessibility in Two-Factor Authentication (2FA). An alternative 2FA solution allows for users to choose from different methods during authentication. For example, users may opt for a voice call where they receive audio instructions that can be responded to via a device keypad. Alternatively or additionally, users may be provided with a link to a touch-based CAPTCHA. These approaches, and aspects thereof, helps ensure that all users, including those with visual impairments or other disabilities, can securely and easily complete the 2FA process, enhancing accessibility and inclusivity while maintaining robust security.