Assume that passwords are selected from four-character
combinations of 26 alphabetic characters. Assume that an
adversary is able to attempt passwords at a rate of one per
second.
a) Assuming no feedback to the adversary until each attempt
has been completed, what is the expected time to discover
the correct password?
- 4 Answers
- 18440 Views
- FCI, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / mundialboy346
a. T = seconds = 63.5 hours
b. Expect 13 tries for each digit. T = 13 × 4 = 52 seconds.
| Is This Answer Correct ? | 12 Yes | 0 No |
Answer / amos
a) involves sequences, thus, 26^4 = 456,976 seconds which is worst case hence average case would be 456,976/2 = 228, 488 seconds or 63.7 hours or ~ 2 days.
b) involves multiplication principle, thus, worst case scenario would be 26*4 = 104 seconds hence average case is 104/2 = 52 seconds
| Is This Answer Correct ? | 2 Yes | 0 No |
Answer / joel
Did none of you ever learn about combinations and permutations in math class? Have you ever wondered what the nCr and nPr buttons do on your calculator? If you are to make a combination of 4 out of 26 possible choices, 26 nCr 4 = 14,950 possible different combinations. That is 14,950 seconds. 14,950/60 = 249.17 minutes / 60 = 4.15 hours...
| Is This Answer Correct ? | 1 Yes | 11 No |
describe the situation in which priority inversion can occur
How do you start up a computer?
What does kernel panic mean?
Which processor is better amd or intel?
What is the most powerful computer in the world 2019?
iam free downloading the KK Dictionery to my system but that is not installed yet. can anybody tell be why this happen and what the system have to install the software.
What happens if you turn off computer during update?
What is the most powerful processor?
What is operating system and its examples?
what are Prerequisites to Install Active Directory in windows 2000 server?
What is the next microsoft operating system?
What is the g in gnu?
Windows 
