Biometrics
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Biometrics are body measurements and calculations related to human characteristics. Biometric authentication is used in computer science as a form of identification and access control. It is also used to identify individuals in groups that are under surveillance.
Biometric Island examining facial image 2D and 3D, voice timbre, and verifying handwritten signature
Authentication
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Authentication is the act of proving an assertion, such as the identity of a computer system user. In contrast with identification, the act of indicating a person or thing's identity, authentication is the process of verifying that identity. It might involve validating personal identity documents, verifying the authenticity of a website with a digital certificate, determining the age of an artifact by carbon dating, or ensuring that a product or document is not counterfeit.
ATM user authenticating himself
A security hologram label on an electronics box for authentication
NSA KAL-55B Tactical Authentication System used by the U.S. military during the Vietnam War – National Cryptologic Museum
A military police officer checks a driver's identification card before allowing her to enter a military base.