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(Enforcing Privacy with Cryptography) The explosive growth of Internet communications and data storage on Internet-connected computers has greatly increased privacy concerns. The field of cryptography is concerned with coding data to make it difficult (and hopefully—with the most advanced schemes—impossible) for unauthorized users to read. In this exercise you’ll investigate a simple scheme for encrypting and decrypting data. A company that wants to send data over the Internet has asked you to write a program that will encrypt it so that it may be transmitted more securely. All the data is transmitted as four-digit integers. Your application should read a four-digit integer entered by the user and encrypt it as follows: Replace each digit with the result of adding 7 to the digit and getting the remainder after dividing the new value by 10. Then swap the first digit with the third, and swap the second digit with the fourth. Then print the encrypted integer. Write a separate application that inputs an encrypted four-digit integer and decrypts it (by reversing the encryption scheme) to form the original number. [Optional reading project: Research “public key cryptography” in general and the PGP (Pretty Good Privacy) specific public key scheme. You may also want to investigate the RSA scheme, which is widely used in industrial-strength applications.]
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Chapter 4 Solutions
Java How to Program, Early Objects (11th Edition) (Deitel: How to Program)
- When using functions in python, it allows us tto create procedural abstractioons in our programs. What are 5 major benefits of using a procedural abstraction in python?arrow_forwardFind the error, assume data is a string and all variables have been declared. for ch in data: if ch.isupper: num_upper = num_upper + 1 if ch.islower: num_lower = num_lower + 1 if ch.isdigit: num_digits = num_digits + 1 if ch.isspace: num_space = num_space + 1arrow_forwardFind the Error: date_string = input('Enter a date in the format mm/dd/yyyy: ') date_list = date_string.split('-') month_num = int(date_list[0]) day = date_list[1] year = date_list[2] month_name = month_list[month_num - 1] long_date = month_name + ' ' + day + ', ' + year print(long_date)arrow_forward
- Find the Error: full_name = input ('Enter your full name: ') name = split(full_name) for string in name: print(string[0].upper(), sep='', end='') print('.', sep=' ', end='')arrow_forwardPlease show the code for the Tikz figure of the complex plane and the curve C. Also, mark all singularities of the integrand.arrow_forward11. Go to the Webinars worksheet. DeShawn wants to determine the number of webinars the company can hold on Tuesdays and Thursdays to make the highest weekly profit without interfering with consultations, which are also scheduled for Tuesdays and Thursdays and use the same resources. Use Solver to find this information as follows: a. Use Total weekly profit as the objective cell in the Solver model, with the goal of determining the maximum value for that cell. b. Use the number of Tuesday and Thursday sessions for the five programs as the changing variable cells. c. Determine and enter the constraints based on the information provided in Table 3. d. Use Simplex LP as the solving method to find a global optimal solution. e. Save the Solver model below the Maximum weekly profit model label. f. Solve the model, keeping the Solver solution. Table 3: Solver Constraints Constraint Cell or Range Each webinar is scheduled at least once on Tuesday and once on Thursday B4:F5 Each Tuesday and…arrow_forward
- Go to the Webinars DeShawn wants to determine the number of webinars the company can hold on Tuesdays and Thursdays to make the highest weekly profit without interfering with consultations, which are also scheduled for Tuesdays and Thursdays and use the same resources. Use Solver to find this information as follows: Use Total weekly profit as the objective cell in the Solver model, with the goal of determining the maximum value for that cell. Use the number of Tuesday and Thursday sessions for the five programs as the changing variable cells. Determine and enter the constraints based on the information provided in Table 3. Use Simplex LP as the solving method to find a global optimal solution. Save the Solver model below the Maximum weekly profit model label. Solve the model, keeping the Solver solution. Table 3: Solver Constraints Constraint Cell or Range Each webinar is scheduled at least once on Tuesday and once on Thursday B4:F5 Each Tuesday and Thursday…arrow_forwardI want to ask someone who has experiences in writing physics based simulation software. For context I am building a game engine, and want to implement physics simulation. There are a few approaches that I managed to find, but would like to know what are other approaches to doing physics simulation entry points from scenes, would you be able to visually draw me a few approaches (like 3 approaces)? When I say entry point to the actual physics simulation. An example of this is when the user presses the play button in the editor, it starts and initiates the physics system. Applying all of the global physics settings parameters that gets applied to that scene. Here is the use-case, I am looking for. If you have two scenes, and select scene 1. You press the play button. The physics simulation starts. When that physics simulation starts, you are also having to update the physics through some physics dedicated delta time because physics needs to happen faster update frequency. To elaborate,…arrow_forwardI want to ask someone who has experiences in writing physics based simulation software. For context I am building a game engine, and want to implement physics simulation. There are a few approaches that I managed to find, but would like to know what are other approaches to doing physics simulation entry points from scenes, would you be able to visually draw me a few approaches (like 3 approaces)?When I say entry point to the actual physics simulation. An example of this is when the user presses the play button in the editor, it starts and initiates the physics system. Applying all of the global physics settings parameters that gets applied to that scene.Here is the use-case, I am looking for. If you have two scenes, and select scene 1. You press the play button. The physics simulation starts. When that physics simulation starts, you are also having to update the physics through some physics dedicated delta time because physics needs to happen faster update frequency.To elaborate, what…arrow_forward
- Male comedians were typically the main/dominant star of television sitcoms made during the FCC licensing freeze. Question 19 options: True False In the episode of The Honeymooners that you watched this week, why did Alice decide to get a job outside of the home? Question 1 options: to earn enough money to buy a mink coat to have something to do while the kids were at school to pay the bills after her husband got laid offarrow_forwardAfter the FCC licensing freeze was lifted, sitcoms featuring urban settings and working class characters became far less common. Question 14 options: True Falsearrow_forwardsolve this questions for me .arrow_forward
- Enhanced Discovering Computers 2017 (Shelly Cashm...Computer ScienceISBN:9781305657458Author:Misty E. Vermaat, Susan L. Sebok, Steven M. Freund, Mark Frydenberg, Jennifer T. CampbellPublisher:Cengage LearningSystems ArchitectureComputer ScienceISBN:9781305080195Author:Stephen D. BurdPublisher:Cengage Learning
- Programming Logic & Design ComprehensiveComputer ScienceISBN:9781337669405Author:FARRELLPublisher:CengageC++ for Engineers and ScientistsComputer ScienceISBN:9781133187844Author:Bronson, Gary J.Publisher:Course Technology PtrPrinciples of Information Systems (MindTap Course...Computer ScienceISBN:9781305971776Author:Ralph Stair, George ReynoldsPublisher:Cengage Learning
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