Caesar Cipher File Encryption/Decryption

This repository contains a C++ program that encrypts and decrypts text files using the Caesar cipher technique. The program allows users to select a file and apply the Caesar cipher to either encrypt or decrypt the file's contents.

Features

• Encrypt a File: Shift each letter in the file by 3 positions in the alphabet.
• Decrypt a File: Shift each letter in the file back by 3 positions in the alphabet to restore the original text.
• User-Friendly Interface: Provides a simple text-based interface to choose encryption, decryption, or exit the program.

Prerequisites

• A C++ compiler (e.g., g++, clang++)

Code Overview

main.cpp

Encryption and Decryption Functions:

• char caesar_cipher_encryption(char c): Encrypts a single character.
• char caesar_cipher_decryption(char c): Decrypts a single character.

File Handling Functions:

• string getfile(): Prompts the user for a filename.
• void encrypt(): Reads a file, encrypts its contents, and writes the encrypted content back to the file.
• void decrypt(): Reads a file, decrypts its contents, and writes the decrypted content back to the file.

Main Function:

Provides a menu for the user to choose encryption, decryption, or exit the program.

Contributing

Contributions are welcome! Please fork the repository and create a pull request with your changes.