IPA IP 2025 Question 69
A question IPA Japan published in 令和7年度 ITパスポート試験 公開問題 問69, translated into English. ITPEC is based on the same exams.
Which of the following is an appropriate combination of terms to be inserted into blanks A and B in the description below concerning the false acceptance rate and the false rejection rate of biometric authentication?
In the authentication accuracy of biometric authentication, when an attempt is made to keep the false acceptance rate low, A becomes high, and when an attempt is made to keep the false rejection rate low, B becomes high.
Explanation
A: security, B: convenience — lowering the false acceptance rate keeps others out, and lowering the false rejection rate lets the genuine user in easily.
The false acceptance rate is the probability of wrongly accepting another person; the false rejection rate is the probability of wrongly rejecting the genuine person. Making the match threshold strict lowers false acceptance, so impostors are rarely let in and security is high, but the genuine user is rejected more often. Making it lenient lowers false rejection, so the user is rarely made to try again and convenience is high, but impostors get in more easily. The two rates trade off against each other.
Answer (b)
Why not others:
- •(a) and (d) — availability means the system can be used when needed; the thing a low false rejection rate improves is the user's convenience
- •(c) — reverses the two: a low false acceptance rate protects security, and a low false rejection rate improves convenience
Key rule: Low false acceptance = security (impostors kept out); low false rejection = convenience (the user gets in); tightening one loosens the other.
Security · AI-written, may contain errors
This question comes from the past questions IPA Japan publishes, translated into English by ITPEC Practice. ITPEC Practice is an independent study tool and is not affiliated with IPA or ITPEC. See the original paper (PDF) or Report an issue.