Haptic2FA: Haptics-Based Accessible Two-Factor Authentication for Blind and Low Vision People

Two-factor Authentication (also known as 2FA or two-step verification) is an authentication method that provides an extra layer of protection to ensure online account security. 2FA methods are used along with other primary authentication methods like PINs and Passwords to verify that the person trying to access any digital account is the person they are claiming to be. However, 2FA methods can be inaccessible for blind and low vision (BLV) users due to the requirement of multiple steps, apps, and/or devices for authentication. In addition, it can be a security risk as screen readers may read out the verification codes to bystanders. To address this, we present Haptic2FA, a haptic-based authentication method to improve 2FA accessibility for BLV users. Here, as a part of the 2FA process, the users are sent a `haptic pattern' (similar to a one-time passcode in traditional 2FA methods) that they are required to enter or select for verification. Through a usability study with 10 BLV participants, we evaluated haptic patterns and input methods for the haptic patterns in the Haptic2FA method. Through the findings, we discuss the accessibility and usability of the Haptic2FA method.