Starting Out With C++: Early Objects (10th Edition)
10th Edition
ISBN: 9780135235003
Author: Tony Gaddis, Judy Walters, Godfrey Muganda
Publisher: PEARSON
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Question
Chapter 15, Problem 4PC
Program Plan Intro
Flexible Encryption
- Include the required header files to the program.
- Define “Encryption” class.
- In public, create a constructor, destructor and pure virtual function.
- In protected, declare the required variable.
- Define the constructor.
- Open the input file and output file.
- If the input file is not present, exit the program.
- If the output file is not present, exit the program.
- Define the destructor.
- Close the input and output file.
- Define the subclass “encrypt” function.
- Declare the required variables.
- Read the input file and write the encrypted form to the output file.
- Define the “Encryption” function.
- In public, define the “transform” function.
- Return the encrypted value.
- In public, define the “transform” function.
- Define the “main()” function.
- Declare the required variables.
- Get the input and output file name from the user.
- Create the objects for the classes.
- Get the encryption key from the user.
- Call the function “setKey” function with the key value.
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Code done in C
Write a piece of code in a function called password that creates a file with a random password (it can be a number). In another function called check_password, the function must ask the user to input the password to login and it should match the password in the file. If it doesn't, it should keep asking the user to keep inputting the right password. Finally, just by passing in the two functions into the main, that would be fine.
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int main()
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<<Write in Java>>
- Challenge 7
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 the data into a code, and then writing the coded contents out to a second file. The second file will be a version of the first file, but written in a secret code. 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.
- Challenge 8
Write a program that decrypts the file produced by the program in Programming Challenge 7. The decryption program should read the contents of the coded file, restore the data to its original state, and write it to another file
1 Encryption
(a). Write a program that will utilise AES for encrypting and decrypting the data from
a file as follows. Your program should take 3 arguments from the command line as
input. The first input should be either 0 or 1 referring to encryption or decryption,
respectively. The second input is the key filename. The third input is the either the
plaintext or encrypted filename.
If the first argument is 0: your program will read an AES key from a file titled key.txt
(passed as second argument) and then will read the plaintext from a file titled plain-
text.txt (passed as third argument), encrypt the contents of plaintext.txt using the key
and save the ciphertext in a file titled encrypted.txt.
If the first argument is 1, your program should decrypt the contents of encrypted.txt.
Sample Command-line Inputs:
java 0 key.txt plaintext.txt
java 1 key.txt encrypted.txt
Chapter 15 Solutions
Starting Out With C++: Early Objects (10th Edition)
Ch. 15.3 - Prob. 15.1CPCh. 15.3 - Prob. 15.2CPCh. 15.3 - What will the following program display? #include...Ch. 15.3 - What will the following program display? #include...Ch. 15.3 - What will the following program display? #include...Ch. 15.3 - What will the following program display? #include...Ch. 15.3 - How can you tell from looking at a class...Ch. 15.3 - What makes an abstract class different from other...Ch. 15.3 - Examine the following classes. The table lists the...Ch. 15 - A class that cannot be instantiated is a(n) _____...
Ch. 15 - A member function of a class that is not...Ch. 15 - A class with at least one pure virtual member...Ch. 15 - In order to use dynamic binding, a member function...Ch. 15 - Static binding takes place at _____ time.Ch. 15 - Prob. 6RQECh. 15 - Prob. 7RQECh. 15 - Prob. 8RQECh. 15 - The is-a relation between classes is best...Ch. 15 - The has-a relation between classes is best...Ch. 15 - If every C1 class object can be used as a C2 class...Ch. 15 - A collection of abstract classes defining an...Ch. 15 - The keyword _____ prevents a virtual member...Ch. 15 - To have the compiler check that a virtual member...Ch. 15 - C++ Language Elements Suppose that the classes Dog...Ch. 15 - Will the statement pAnimal = new Cat; compile?Ch. 15 - Will the statement pCreature = new Dog ; compile?Ch. 15 - Will the statement pCat = new Animal; compile?Ch. 15 - Rewrite the following two statements to get them...Ch. 15 - Prob. 20RQECh. 15 - Find all errors in the following fragment of code,...Ch. 15 - Soft Skills 22. Suppose that you need to have a...Ch. 15 - Prob. 1PCCh. 15 - Prob. 2PCCh. 15 - Sequence Sum A sequence of integers such as 1, 3,...Ch. 15 - Prob. 4PCCh. 15 - File Filter A file filter reads an input file,...Ch. 15 - Prob. 6PCCh. 15 - Bumper Shapes Write a program that creates two...Ch. 15 - Bow Tie In Tying It All Together, we defined a...
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