Caesar Cipher

Overview

This program is an implementation of the Caesar Cipher.

https://en.wikipedia.org/wiki/Caesar_cipher

The following steps are performed during encryption:

• Read the plain text input string.
• Remove all non-alpha characters from the string.
• Convert any lower case characters to upper case.
• Apply the cipher.
• Display the encrypted text.

Build

Use the following command to build the program:

./build.sh

Usage

To encrypt a string:

./caesar -e "STRING TO ENCRYPT"

The above command returns:

VWULQJWRHQFUBSW

To decrypt a string:

./caesar -d VWULQJWRHQFUBSW

The above command returns:

STRINGTOENCRYPT