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Quiz 9 – statistics
In class, we have discussed 7 properties of different biometric modalities. Out of the enlisted biometric modalities, which one has the poorest ¡®permanency¡¯.
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2) fingerprint 3) DNA
In class, we have discussed the relationship(s) between a biometric system¡¯s false reject (FR) probability and false accept (FA) probability and the system¡¯s convenience and security. In the context of those relationships, which of the following statements is not correct.
1) A lower FR implies a higher system¡¯s convenience.
2) A lower FA implies a higher system¡¯s security.
3) Knowing the value of FR is not sufficient to determine the system¡¯s security.
4) Knowing the value of FA is sufficient to determine the system¡¯s convenience.
biometric system 1
biometric system 2
A Canadian bank plans to introduce biometrics-based access control on its ATM machines. The bank is currently considering two different biometric systems, whose FR-FA characteristics are shown in the below figure. If the bank¡¯s main objective is to implement a system with better (i.e., lower) crossover error rate (CER), which of the two systems should be the bank¡¯s ultimate choice?
1) biometric system 1
3) both systems have the same CER, so the bank could choose either of them
set of points where FA = FR
2) biometric system 2
Consider the following password policy:
¡°Passwords should be 6 characters long and be a mix of lower-case English-alphabet letters and numbers. Passwords consisting of letters only or numbers only are not acceptable.¡±
What is the overall number of acceptable passwords under this policy?
1) 2,176,782,336
2) 2,057,963,143 20% grade (26+10)6 = 2,176,782,336
3) 1,966,966,560 20% grade
4) 1,866,866,560
100% grade
all 6-char. long passwords consisting of letters and numbers
answer = (26+10)6 – 106 – 266 = 1,866,866,560
6-char. long passwords consisting of letters only
6-char. long passwords consisting of numbers only
(false reject)
biometric system 1
biometric system 2
(false accept)
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