| Method |
Function mechanism |
Advantages |
Disadvantages |
| Finger print |
Difference between human finger prints |
Very low error rate, being used for over 10 years |
Dirty or damaged fingers can affect accuracy |
| Iris |
Using laser or infrared beam |
Very reliable with low error rate |
Members phobia to expose eyes to light |
| Facial |
Using face expressions and physical measures |
Simply accepted by users |
Not much accurate due to changing facial expressions |
| Retina |
Imaging of retina |
Very reliable with low error rate |
Members phobia to expose eyes to light |
