Biometrics

Biometrics refers to the identification of humans by their characteristics or traits. Biometrics is used in computer science as a form of identification and access control based on knowing a person's biological features.
examples of these devices are :

1- Face scanner : Biometric face scanners identify a person by taking measurements of a person face. For example, the distance between the persons chin, eyes, nose, and mouth. These types of scanners can be very secure assuming they are smart enough to distinguish between a picture of a person and a real person.



2- Finger scanner : A finger scanner identifies the person by their finger print, and it is a secure method of identification as each person has a different finger print.



3- Retina or iris scanner : A biometric retina or iris scanner identifies a person by scanning the iris or retina of their eyes. These scanners are more secure biometric authentication schemes when compared to the other devices because there is no known way to duplicate the 
retina or iris. 




4- Voice scanner : A voice analysis can help improve security, but some less sophisticated scanners can be bypassed using a tape. Scanner will mathematically break down a person's voice to identify them. These scanners can cause a problem if there is any change in the voice as the voice should match the one in the system.