Listening-Watch system uses an activity tracker or a smartwatch and random browser-generated speech sounds. It is a redesigned approach, expanding upon the previous Sound-Proof approach that relied on ambient sounds and ended up being completely vulnerable to attackers who were near the user, as well as remote attackers. Low-sensitivity microphones found in current wearable devices cannot capture distant sounds, which will thwart proximity attackers, the researchers say. The system uses speech transcription and audio correlation analysis to extract the verification code and determine the proximity between the watch and terminal.”]
Source: https://www.csoonline.com/article/3300746/listening-watch-wearable-system-provides-secure-2fa.html