Google has acquired SlickLogin - an Israeli start-up behind the technology that allows websites to verify a user's identity by using sound waves.
It works by playing a uniquely generated, nearly-silent sound through computer speakers, which is picked up by an app on the user's smartphone.
The app analyses the sound and sends a signal back to confirm the identity.
The technology can be used either as a replacement for a password or as an additional security layer.
Many firms, especially those in sectors such as financial services, have been adopting a two-step verification for users.
The steps include matching the user name and the password plus a second layer of verification.
fine until you loose your phone!!!