The Gateway to Computer Science Excellence
First time here? Checkout the FAQ!
x
+1 vote
191 views

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 (40.2k points)
recategorized by | 191 views

1 Answer

0 votes
Ans. B
answered by (17 points)
0
You have to provide justification !


Quick search syntax
tags tag:apple
author user:martin
title title:apple
content content:apple
exclude -tag:apple
force match +apple
views views:100
score score:10
answers answers:2
is accepted isaccepted:true
is closed isclosed:true

39,512 questions
46,665 answers
139,709 comments
57,485 users