What is the most likely cause of unreliability in biometric technology?

Question

Options

• ASpoofing by an imposter
• BFailure of the scanning device
• CFailure to recognize a legitimate user
• DIncorrect recognition (user recognized as the wrong person)

• A
  4% (1)
• B
  8% (2)
• C
  15% (4)
• D
  73% (19)

Explanation

Incorrect recognition (D) is the most likely cause of unreliability because biometric systems inherently produce probabilistic matches rather than exact ones - environmental factors like dirt, aging, injury, or angle variations can cause a legitimate user to be matched against the wrong stored profile, producing a false match rather than a simple rejection. This is distinct from a system simply failing to recognize someone (C), which would deny access but at least fail safely; incorrect recognition is more insidious because the system thinks it succeeded.

Why the distractors are wrong:

• (A) Spoofing is a security threat, not a reliability issue - it's an attacker's deliberate action, not a system defect.
• (B) Device failure causes downtime, but modern scanners are generally reliable hardware; it's not the most likely source of ongoing unreliability.
• (C) Failure to recognize a legitimate user (false rejection) does occur, but it's the safer failure mode and less common than cross-matching errors in systems tuned to minimize false rejections.

Memory tip: Think of biometrics as "fuzzy" matching - the bigger risk isn't "I don't know you" (C) but "I think I know you" and getting it wrong (D). The word unreliability points to incorrect behavior, not just failure.

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