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
- 17611 Views
- FCI, I also Faced
- E-Mail Answers
Answer Posted / 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 |
Post New Answer View All Answers
any body tell me what are the prob's mostly we face and send some critical prob in real time environment in Solaris and veritas (VXVM,VCS)
What's the best operating system?
How do I boot up my computer?
Can you have concurrency but not parallelism?
1) What is an Virtual memory? 2) How do we test API's in both Windows/Linux/Unix? 3) What is an IOCTL? 4) How do you open a char device through API's? 5) What is major num/ minor num? 6) What is the max num for minor num? 7) Who gives you the major / minor numbers? 8) Reverse a string using recursive func. 9) fork/vfork/clone. 10) What does fork returns? 11) What is a zombie process? 12) What happens when a child completes before parent tries to wait for it? 13) Interrupt handlers, top-hdnl....?
Can a laptop have both ssd and hdd?
what kind of operating(s)systems would be needed (and explain why) in an environment where there exist various cluster of networks which are all interconnected in different geographical areas with strong emphasis on online applicating process.
Can I restore my computer to yesterday?
What is the latest android operating system?
What is the most powerful computer in the world 2019?
What is the best os for laptop?
What do you mean by Run time Errors?
How do you kill a computer with command prompt?
Which is your favorite editor, shell, programming shell and why?
What is the name of first operating system?
