Did you know that each individual has a unique heartbeat? Researchers from the University of Toronto (Foteini Agrafioti and Karl Martin) have fitted a watch with an electrocardiogram (ECG) sensor to scan your heartbeat and compare it to a database of pre-recorded cardiac rhythms for a match. If successful, this can be used to authenticate the user for email, online banking etc. This is called Nymi, created in 2011 and has been successfully trialled by the Royal Bank of Canada and Halifax – Lloyds Banking Group. If this takes off, every smart watch may be used for user authentication (e.g. Fitbit)
The good: Seamless user experience, less reliance on passwords, works even during elevated heart-rate
The bad: False positives, man-in-the-middle attacks (from continuous authentication), competition against Apple Pay
The overall: Wearable technologies will disrupt the way in which we carry out our everyday tasks. Great competition in this area will hopefully result in a better overall experience for the end user.
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Source : Using your FitBit to login? Anything is possible, shuutech ( https://shuutech.wordpress.com/2015/03/15/using-your-fitbit-to-login-anything-is-possible/ )