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For your ATM debit card, you have a $4$-decimal-digit personal secret code. In the absence of any clue, a brute-force attack takes time-$'t'$ to crack the code on an ATM terminal. Therefore $'t'$ is the secure-time for a customer to report in case the card is misplaced. Your Bank has decided to facilitate an increased secure-time. Out of the following, which option should provide the largest rise in the value of $'t'$?

  1. Instead of 4-decimal-digits, maintain the personal secret code in 4-hexadecimal-digits.
  2. Instead of 4-decimal digits, maintain a 5-decimal-digit personal secret code.
  3. Reduce the processing speed of the ATM terminals to the half of their current speed.
  4. None of the above provides any improvement.
asked in Computer Networks by Boss (29.5k points)
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1 Answer

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Ans. B
answered by (197 points)
0
You have to provide justification !

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