The buzz of your skull could be used to identify you in place of a password login.
A prototype system called SkullConduct picks up on the way sound waves change as they pass through a person's skull.
Because everyone's skull is different, each person's sound is unique, meaning it can be used as a form of biometric identification.
The headset uses two bone-conducting plates that sit on the cheekbones, next to the ears.
A team from the University of Stuttgart sent and received identical sound waves through the skulls of 10 different people.
The tiny differences between the sound waves after they had passed through the head could be used to identify the individuals with 97% accuracy.
The researchers say that the system could be implemented in a virtual Google Glass-style headset, so that people could log onto online services without having to remember a password.
The prototype was tested without any background noise, so making the system work effectively in an everyday environment will be the team's next task.
The sound - some white noise - could also be annoying to users, and may need to be replaced with a short piece of music or a jingle, the researchers added.
The team's work will be presented at the Conference for Human-computer Interaction in San Jose, California next month.
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