Starting Out with Java: From Control Structures through Data Structures (4th Edition) (What's New in Computer Science)
4th Edition
ISBN: 9780134787961
Author: Tony Gaddis, Godfrey Muganda
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Videos
Textbook Question
Chapter 11, Problem 7PC
File Encryption Filter
File encryption is the science of writing the contents of a file in a secret code. Your encryption
Although there are complex encryption techniques, you should come up with a simple one of your own. For example, you could read the first file one character at a time, and add 10 to the character code of each character before it is written to the second file.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
These are the steps to take if you accidentally delete a file and need to get it back.
Prog 1. File Encryption: File encryption is the science of writing the contents of a file in a secret code. Your encryption program should work like a filter reading the contents of one file, modifying each character in the input file into a code, and then writing the coded characters out to a second file. The second file will be a version of the first file but written in a secret code.
In Notepad or something similar, you will create a file with text in it. It should be several lines long. Your program should read the file character by character and make some change to the character before writing that character to a second new encrypted file. See program 13-8 to see how to read and write one character at a time.
You may come up with an encryption technique of your own or use something simple like adding 10 to the ASCII code of each character in the file before it is written to the second file.
Lab Assignment 2: Playfair Cipher
Overview: You are required to use the Playfair cipher to encrypt the message: "Butch." You will
do the encryption by hand. The key for encryption is “Govern." You will need to show your work
for the encryption process. Your submission should be a typed text file
Chapter 11 Solutions
Starting Out with Java: From Control Structures through Data Structures (4th Edition) (What's New in Computer Science)
Ch. 11.1 - Prob. 11.1CPCh. 11.1 - Prob. 11.2CPCh. 11.1 - Prob. 11.3CPCh. 11.1 - Prob. 11.4CPCh. 11.1 - Prob. 11.5CPCh. 11.1 - Prob. 11.6CPCh. 11.1 - Prob. 11.7CPCh. 11.1 - Prob. 11.8CPCh. 11.1 - Prob. 11.9CPCh. 11.1 - When does the code in a finally block execute?
Ch. 11.1 - What is the call stack? What is a stack trace?Ch. 11.1 - Prob. 11.12CPCh. 11.1 - Prob. 11.13CPCh. 11.1 - Prob. 11.14CPCh. 11.2 - What does the throw statement do?Ch. 11.2 - Prob. 11.16CPCh. 11.2 - Prob. 11.17CPCh. 11.2 - Prob. 11.18CPCh. 11.2 - Prob. 11.19CPCh. 11.3 - What is the difference between a text file and a...Ch. 11.3 - What classes do you use to write output to a...Ch. 11.3 - Prob. 11.22CPCh. 11.3 - What class do you use to work with random access...Ch. 11.3 - What are the two modes that a random access file...Ch. 11.3 - Prob. 11.25CPCh. 11 - Prob. 1MCCh. 11 - Prob. 2MCCh. 11 - Prob. 3MCCh. 11 - Prob. 4MCCh. 11 - FileNotFoundException inherits from __________. a....Ch. 11 - Prob. 6MCCh. 11 - Prob. 7MCCh. 11 - Prob. 8MCCh. 11 - Prob. 9MCCh. 11 - Prob. 10MCCh. 11 - Prob. 11MCCh. 11 - Prob. 12MCCh. 11 - Prob. 13MCCh. 11 - Prob. 14MCCh. 11 - Prob. 15MCCh. 11 - This is the process of converting an object to a...Ch. 11 - Prob. 17TFCh. 11 - Prob. 18TFCh. 11 - Prob. 19TFCh. 11 - True or False: You cannot have more than one catch...Ch. 11 - Prob. 21TFCh. 11 - Prob. 22TFCh. 11 - Prob. 23TFCh. 11 - Prob. 24TFCh. 11 - Find the error in each of the following code...Ch. 11 - // Assume inputFile references a Scanner object,...Ch. 11 - Prob. 3FTECh. 11 - Prob. 1AWCh. 11 - Prob. 2AWCh. 11 - Prob. 3AWCh. 11 - Prob. 4AWCh. 11 - Prob. 5AWCh. 11 - Prob. 6AWCh. 11 - The method getValueFromFile is public and returns...Ch. 11 - Prob. 8AWCh. 11 - Write a statement that creates an object that can...Ch. 11 - Write a statement that opens the file...Ch. 11 - Assume that the reference variable r refers to a...Ch. 11 - Prob. 1SACh. 11 - Prob. 2SACh. 11 - Prob. 3SACh. 11 - Prob. 4SACh. 11 - Prob. 5SACh. 11 - Prob. 6SACh. 11 - What types of objects can be thrown?Ch. 11 - Prob. 8SACh. 11 - Prob. 9SACh. 11 - Prob. 10SACh. 11 - What is the difference between a text file and a...Ch. 11 - What is the difference between a sequential access...Ch. 11 - What happens when you serialize an object? What...Ch. 11 - TestScores Class Write a class named TestScores....Ch. 11 - Prob. 2PCCh. 11 - Prob. 3PCCh. 11 - Prob. 4PCCh. 11 - Prob. 5PCCh. 11 - FileArray Class Design a class that has a static...Ch. 11 - File Encryption Filter File encryption is the...Ch. 11 - File Decryption Filter Write a program that...Ch. 11 - TestScores Modification for Serialization Modify...Ch. 11 - Prob. 10PC
Additional Engineering Textbook Solutions
Find more solutions based on key concepts
Milling has two feeds. What are they, and which one is an input parameter to the machine tool?
Degarmo's Materials And Processes In Manufacturing
Largest/Smallest Array Values Write a program that lets the user enter ten values into an array. The program sh...
Starting Out with C++ from Control Structures to Objects (9th Edition)
Can you reference a static variable by name within the definition of a non-static method without using a class ...
Java: An Introduction to Problem Solving and Programming (8th Edition)
How are relationships between tables expressed in a relational database?
Modern Database Management
In what year was Plankalkl designed? In what year was that design published?
Concepts Of Programming Languages
What are classes responsibilities?
Starting Out with Programming Logic and Design (5th Edition) (What's New in Computer Science)
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.Similar questions
- This is the most effective file organization method in which one must handle all data records in a file namedarrow_forwardWhen importing a Text file, why is it important to move through each step of the Text Import Wizard?arrow_forwardWhat can you determine about a file by looking at it's properties ?arrow_forward
- PrintWriter and Scanner - text file I/O DataInputStream and DataOutputStream - binary file I/O RandomAccessFile - binary file i/o where every record is the same number of bytes so that you can seek to a specific record ObjectInputStream and ObjectOutputStream - read and write objects.arrow_forwardWord List File Writer: Write a program that asks the user how many words they would like to write to a file, andthen asks the user to enter that many words, one at a time. The words should be writtento a file (in python)arrow_forwardCreate file Write data Read data Delete data And print the messages through System.out.println. Use buffer reader to read file Programming language : Javaarrow_forward
- Objective: Practice file handling Lab Description: Write a python script (with comments) that computes the average score for an unknown number of students in a file. Specifically, your script should: Ask for a filename name (that has scores in it) Open the scores file Verify the scores file opened correctly Read the student's name and their four scores Display the student's name, all of their scores and their average to the screen Writes the students name and the scores' average to a file name "averages.csv" Close both files For example, the following are examples of correct execution (with the text in bold being the input from the user): Input file project4-inputA.txt: Output to the screen: Output file "averages.csv" Мary 76 89 82 100 Joey Please enter the scores filename: project4-inputA.txt # Student name, grade average You entered project4-inputA.txt Opened scores file project4-inputA.txt Mary scores: 76.0 89.0 82.0 100.0 average: 86.75 Joey scores: 91.0 81.0 83.0 95.0 average:…arrow_forwardIf you accidentally delete a file and want to retrieve it, you will need to follow the steps listed below in order to do so.arrow_forwardPython The program should open a specified text file, read its contents, then use the dictionary to writean encrypted version of the file’s contents to a second file. Each character in the second file should contain the code for the corresponding character in the first file. Your program contains both encryption AND decryption functions. Please do not put them in separate programs. Your program provides a MENU that offers the user a choice to encrypt or decrypt the file and call the respective function. Your encoder function will use the Caesar Ciphe to translate the file Your encoder function will first convert all input characters to upper case. This means that the output of encrypted text should be in CAPITALS. You must use a string method to convert! Your implementation must use a dictionary Your implementation must use string methods for converting casearrow_forward
- Why is it important for a program to close an open file as soon as it is done using the file? Give two reasons.arrow_forwardWhen a program makes use of a file, what are the three steps that it must take?arrow_forwardA file's physical description differs from its logic in the following ways:arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Files & File Systems: Crash Course Computer Science #20; Author: CrashCourse;https://www.youtube.com/watch?v=KN8YgJnShPM;License: Standard YouTube License, CC-BY
UNIX Programming (Part - 10) The File System (Directories and Files Names); Author: ITUTEES;https://www.youtube.com/watch?v=K35faWBhzrw;License: Standard Youtube License