Researchers at the University of Waterloo and the Rochester Institute of Technology have developed a new authentication method that could help blind and low-vision (BLV) users more securely access their devices. The new method, OneButtonPIN, allows users to input PIN codes using a single large button and a series of haptic vibrations.
How does OneButtonPIN work?
OneButtonPIN uses haptic vibrations imperceptible to outsiders. When prompted to enter a PIN code, the user presses and holds a large button on their smartphone screen. This activates a series of vibrations separated by pauses; the user counts the number of vibrations corresponding to the number they desire to enter, then releases the button and repeats the process until the desired numbers are entered.
What was involved in the research study?
In a research study, nine BLV participants installed OneButtonPIN apps on their phones. They were first tasked with entering randomly generated PINs using the OneButtonPIN method several times, then instructed to use the app at least once a day for a week as part of a diary study.
What was revealed in the study?
The study revealed that OneButtonPIN allowed users to input codes with an average of 83.6 per cent accuracy or above, as opposed to 78.1 per cent accuracy using traditional methods.
Was the method more secure?
The method also proved to be incredibly secure. In the second stage of the study, 10 sighted participants watched videos of people using both traditional PIN entry methods and OneButtonPIN, then attempted to guess their PIN codes. Every participant was able to successfully guess users’ PINs using traditional methods, but no one could successfully guess code input using OneButtonPIN.
While OneButtonPIN was designed for blind and low vision users, many users will appreciate the added security. The study was published in the Proceedings of the ACM on Human-Computer Interaction.
