Networks for Monetary Transactions an der TU München

Biometrics authentication (or realistic authentication) is used in computer science as a form of identification and access control. Biometric identifiers are the distinctive, measurable characteristics used to label and describe individuals and are often categorized as physiological or behaviourial characteristics.

• face
• fingerprint
• hand
• iris
• DNA

• keystroke
• signature
• voice

True

• User provides biometric data to the system. Record of several images
• Biometric system translates this to a template
• This template is then stored
• Subsequent authentication is done against the template:
  • User may be required to enroll several times to get a clean template
  • Presentation: process by which a user provides biometric data to an acquisition device

True

• Fundamental to biometrics
• A small file derived from the distinctive features of a user's biometric data
• Used to perform biometric matches
• Templates are often vendor specific (depending on the algorithm used by the vendor)

Match decisions between templates based on a score

• Correlation resulting from match between two templates
• Biometric apps use propritary algorithms to generate scores
• Thus biometric systems do not render absolute matches, only probability of match

• User provides biometric data to the system
• Biometric system translates this to a template
• The system begins comparing the template to stored templates
  • Templates will usually not match exactly
  • Instead, the 'closeness' of the matches is given a 'score'
  • If the 'score' is above some threshold, user is authenticated

• Acquire 'identification'
• Acquire bio data, simplify to template
• Match template against the template of the users ID in the system

• Acquire bio data, simplify to template
• Match template against all other templates, searching for the highest scoring template

• Privacy: keeping templates safe from unauthorized users
• Security: keeping templates secure so that one cannot be exchanges for another