  A Bio-metrics system is actually a pattern recognition system that utilizes
various patterns like iris, retina and biological traits like fingerprint,
voice recognition, facial geometry and hand geometry. What makes Bio-metrics
really attractive is that the various security codes like passwords and ID
cards can be interchanged, stolen or duplicated. To enhance the security and
reliability of the system, physiological traits can be used. This paper gives
the overview of key bio-metric technologies and basic techniques involved and
their drawbacks. Then the paper illustrates the working of ECG and the various
opportunities for ECG are also mentioned.
