User Account

All Pages

Find the average number of guesses

Assignment Help Basic Statistics
Reference no: EM131682437

Question: A hacker is trying to break into a password-protected website by randomly trying to guess the password. Let m be the number of possible passwords.

(a) Suppose for this part that the hacker makes random guesses (with equal probability), with replacement. Find the average number of guesses it will take until the hacker guesses the correct password (including the successful guess).

(b) Now suppose that the hacker guesses randomly, without replacement. Find the average number of guesses it will take until the hacker guesses the correct password (including the successful guess).

(c) Show that the answer to (a) is greater than the answer to (b) (except in the degenerate case m = 1), and explain why this makes sense intuitively.

(d) Now suppose that the website locks out any user after n incorrect password attempts, so the hacker can guess at most n times. Find the PMF of the number of guesses that the hacker makes, both for the case of sampling with replacement and for the case of sampling without replacement.

Reference no: EM131682437

Questions Cloud

Discuss the energy policy of the united states : Explain what you feel should be the energy policy of the United States, based on the various energy options we discussed in class.
Protect the network from intrusion : When configuring layer 3 OSI devices, which security controls are necessary to protect the network from intrusion?
What is the budgeted accounts receivable at the end of july : Cachet Inc. had a $93,000 balance in Accounts Receivable on July 1. What is the budgeted accounts receivable at the end of July?
Two techniques for recovering passwords : Discuss two techniques for recovering passwords. How effective do you believe that these techniques are in real situations?
Find the average number of guesses : Suppose for this part that the hacker makes random guesses (with equal probability), with replacement. Find the average number of guesses.
Discuss concentrated animal feeding operation : Should the county issue a permit for a new Concentrated Animal Feeding Operation
Digital forensic evidence from the cloud : Discuss the challenges associated with obtaining digital forensic evidence from the cloud.
Python file head display : The program should display only the first five lines of the file's contents. If the file contains less than five lines, it should display the file's entire.
What is the impact of the exclusionary rule : Why did the Supreme Court create the exclusionary rule? Explain briefly why the exclusionary rule cannot be found in the U.S. Constitution.

Reviews

Write a Review

Basic Statistics Questions & Answers

  Required condition for being a probability distribution

Show that it satisfies the required condition for being a probability distribution.

  Probability at least one is allergic to pollen

If two people are randomly selected, what is the probability both are allergic to pollen? What is the probability at least one is allergic to pollen?

  Find confidence interval for actual proportion of families

In a random sample of 500 families owning sets in the town was found that 340 subscribed to ASTRO. Find a 95% confidence interval for actual proportion of families in this town who subscribe to ASTRO.

  Question about statistics-hypothesis testing

Nut problem: Manager claims 336g and a population standard deviation of 11g. We sample 64 bags and find

  What proportion of the output will be nonconforming

If the process is in control at the present values of its parameters, what proportion of the output will be nonconforming, assuming a normal distribution of the characteristic?

  Expected number of republicans

What is the expected number of Republicans who will win office in the coming election?

  Assuming variable normally distributed

find probabilty that the average of those counts is more than 83.0 mosquitoes per square meter. Assume the variable is normally distributed.

  Construct confidence interval for the mean monthly rent

Construct a 95% confidence interval for the mean monthly rent of all advertised one-bedroom apartments. A 95% confidence interval for the mean monthly rent is?

  Find the indicated quantities given that x is a normal

find the indicated quantities given that x is a normal random variable with a mean of 30 and a standard deviation of

  Hypothesis test for one-way analysis of variance

Is there evidence to suggest a difference in the mean waiting times at the four body shops?

  The events x and y are mutually exclusive suppose px 05

question the events x and y are mutually exclusive. suppose px .05 and py .02. what is the probability of either x or

  Using a t test for dependent means show the steps involved

When using a t test for dependent means, show the steps involved in calculating the estimated population variance based on scores in this sample:

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

Submit Assignment

Academics

Major Subjects

Majors

Get In Touch

whatsapp: +1-415-670-9521

Phone: +1-415-670-9521

Email: [email protected]

TERMS & POLICIES

HELP & SUPPORT

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd