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Biometrics

Introduction      

Physiological or Behavioral

Verification vs. Identification

Applications

Biometrics Technologies

How it works

Benefits

Are Biometric Systems Difficult to Use?

Security of Biometrics           Template

What Factors Cause Biometric Systems to Fail?

Application design

 

Biometrics

Are Biometric Systems Difficult to Use?

Biometrics are much easier to use than one might expect. Here is a brief technology-by-technology summary of how one interacts with biometric systems.

Fingerprint. When prompted, the user gently places his or her finger on a postage-stamp sized optical or silicon surface. This surface, known as a platen, is built into a peripheral device, mouse, keyboard, or PCMCIA card. The user generally must hold the finger in place for 1-2 seconds, during which automated comparison and matching takes place. After a successful match, the user has access to programs, files, or resources. Typical verification time from “system ready” prompt: 2-3 seconds.

Facial recognition. User faces the camera, preferably positioned within 24 inches of the face. Generally, the system will locate one’s face very quickly and perform matches against the claimed identity. In some situations, the user may need to alter his facial aspect slightly to be verified. Typical verification time from “system ready” prompt: 3-4 seconds.

Voice recognition. User positions him or herself near the acquisition device (microphone, telephone). At the prompt, user either recites enrollment pass phrase or repeats pass phrase given by the system. Typical verification time from “system ready” prompt: 4-6 seconds.

Iris-scan. User positions him or herself near the acquisition device (peripheral or standalone camera). User centers eye on device so he or she can see the eye’s reflection. Depending on the device, the user is between 2-18 inches away. Capture and verification are nearly immediate.  Typical verification time from “system ready” prompt: 3-5 seconds.

Retina-scan. User looks into a small opening on a desktop or wall-mounted device. User holds head very still, looking at a small green light located within the device.  Typical verification time from “system ready” prompt: 10-12 seconds.

Hand geometry. User places hand, palm-down, on an 8 x 10 metal surface with five guidance pegs. Pegs ensure that fingers are placed properly, ensure correct hand position. Typical verification time from “system ready” prompt: 2-3 seconds.

Signature-scan. User positions himself to sign on tablet (if applicable). When prompted, user signs name in tablet’s capture area. Typical verification time from “system ready” prompt: 4-6 seconds.

Keystroke-scan.  User types his or her password or pass phrase. Typical verification time from “system ready” prompt: 2-3 seconds.

 

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