According to Computerworld website, US scientists suggest using an electrocardiogram as a biometric authentication factors. This is useful in situations where you have a wearable device interested in gathering information about their health, and electrocardiogram data will still be transmitted to a dedicated server. "
However, the authors of the proposal warn that only by means of ECG can not establish a user's identity with absolute certainty. The resulting data have some variation - they are affected by somatic and psychological condition of the person, his age and the presence of specific diseases. This factor authentication can only be used as an auxiliary.