File encryption is the science of writing the contents of a text file in a secre

Question

File encryption is the science of writing the contents of a text file in a secret code. Your encryption/decryption 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 ASCII code of each character before it is written to the second file.

The program should have a menu that allows the user to perform the following tasks:

The source and destination file names should be displayed as part of the menu, if the user has specified.

For example, at the program start the menu could look like:

1: Enter source filename
2: Enter destination filename
3: Encrypt file
4: Decrypt file
0: Exit

After both file names are entered, the menu could look like:

1: Enter source filename
2: Enter destination filename
3: Encrypt file (source.txt)
4: Decrypt file (encrypted.txt)
0: Exit

Explanation / Answer

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