The patented technology works by playing a uniquely generated, almost silent audio through computer speakers, and this is then picked up by an app running on a nearby smartphone or tablet. This app analyses the sound and sends back a signal to confirm the identity, after which the user is able to log-in.
The technology could well be used to replace passwords, or alternatively added as an additional security layer to improve password security. Google was one of the early adopters of two-factor authentication.
SlickLogin confirmed the acquisition on its website but did not disclose any financial details on the deal.
"Today we're announcing that the SlickLogin team is joining Google, a company that shares our core beliefs that logging in should be easy instead of frustrating, and authentication should be effective without getting in the way," said the company in a statement.