問66
頻出度★★★
バイオメトリクス認証で利用する身体的特徴に関する次の記述中の a，b に入れる字句の適切な組合せはどれか。 バイオメトリクス認証における本人の身体的特徴としては，[ a ] が難しく，[ b ] が小さいものが優れている。
令和2年度 ITパスポート試験 問66
This question's explanation and your answers so far.
解説
問 66
- ア
正解 Biometric authentication verifies a person's identity using physical characteristics such as fingerprints, iris, and veins. A good characteristic must satisfy two conditions. First, it must be “difficult to forge”— if others can copy or fake the characteristic, impersonation becomes easy and the authentication loses its meaning. Second, its “aging change over time must be small”— if the characteristic changes greatly with age or the passage of time, it cannot be matched against the registered data, and even the genuine person fails to authenticate. Therefore the combination a=forgery, b=aging change over time — choice “ア”— is correct.
Incorrectイ
a=forgery is correct, but b=individual variation is wrong. Individual variation is not better when “smaller”; rather, the larger it is, the easier one can be distinguished from others and the higher the authentication accuracy, so larger is desirable. When it is small, a different person is easily mistaken for the genuine one.
Incorrectウ
b=aging change over time is correct, but a=distinguishing is wrong. Distinguishing should not be “difficult”but easy — authentication holds only when the genuine person and others can be correctly told apart. With a characteristic that is hard to distinguish, identity cannot be verified.
Incorrectエ
Both a=distinguishing and b=individual variation are wrong. Distinguishing should be easy (difficult is inappropriate), and individual variation is better when larger (which does not fit the statement that a smaller one is superior). Both conditions are reversed.
ここがポイント
- The conditions for a physical characteristic suited to biometric authentication — being difficult to forge (high resistance to impersonation) and having small aging change over time (stable even as time passes).
- Do not get the direction of a “good characteristic”backwards — the larger the individual variation, the better one can be distinguished from others, and the easier the distinguishing, the more accurate the identity verification.
用語