As it turns out, the way sound resonates in our ear canal is a highly personal process. So NEC has devised earbuds that include a microphone that measures how a transmitted sound travels through the inner ear, identifying an individual. What is exciting about this technology is that the whole verification process takes under one second, and is 99% accurate.
NEC hopes to have this technology in commercial use by 2018. The company sees it being applied during confidential calls when a person's identity needs to be verified. It also sees a use for this in navigation. NEC doesn't mention using this technology to replace a fingerprint scanner on a smartphone, but that seems like a logical possibility.
NEC has developed a method that can identify a person by using sound
source: NEC via Geek.com