Flexible Encryption Program Plan: 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. 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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Chapter 15, Problem 4PC

Program Plan Intro

Flexible Encryption

Program Plan:

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.

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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