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Biometric authentication describes an electronically based system that verifies an individual\'s identity based on a physiological or behavioral characteristics such as fingerprints, iris scans, voice recognition, facial recognition, etc. The application field of biometric authentication systems includes law enforcement, banking, medical and government institutions. However, the main application field of biometric authentication is the consumer market, including consumer electronics, home security and smart cards.

The main working principle of biometric authentication is based on the analysis of a person\'s unique biological characteristics such as fingerprints, iris scans, voices, facial features etc. These biological characteristics provide the capability to differentiate individuals from one another which can be used to verify a person\'s identity.

Biometric authentication usually involves three steps: capture, template processing and matching, and authentication.

Capture is the first step of biometric authentication. In this step, the biometric device captures the image of the biometric feature, or the acoustic sound, or it reads the valid biometric identifier such as a finger, face, eye, or voice.

Template processing and matching is the second step of biometric authentication. In this step, the biometric device extracts the unique features from the biometric sample input and compares them with the reference biometric information stored in a secure database. Depending on the accuracy and speed of the system, the comparison process is usually performed at the local device or over a network.

Finally, authentication is the step where the biometric feature is compared to the reference biometric data and a result is generated. This result determines if the user is successfully authenticated or not.

Biometric authentication is an effective solution for ensuring security without the need for access cards. It is also very convenient for the users as it allows them to access secured areas quickly and without the need of remembering multiple passwords. Moreover, biometric authentication can be used in various industries, such as banking, healthcare, and government, since it provides an added layer of security.

Biometric authentication is a reliable way of verifying a person\'s identity. It is highly secure and very cost effective compared to other methods of authentication, such as access cards. Moreover, it is very convenient for the users since it eliminates the need for manual authentication processes. Additionally, biometric authentication can also be used for other applications, such as access control, prevention of identity theft, attendance monitoring, and enhancement of customer service.

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