Password Vulnerabilities

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Q: Kyrie is a Security Administrator. To access his laptop, he only needs to enter a 4-digit personal identification number (PIN). He also set a token to perform offline checking whether he has input the right PIN. Which of the below attacks is a foreseeable result of Kyrie’s folly?

a. Brute force

b. Replay

c. Smurf

d. Man-in-the-middle

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