Caesar Cipher Using C

A simple command-line Caesar Cipher encryption and decryption tool written in C.

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🔐 What is Caesar Cipher?

The Caesar Cipher is a classic substitution encryption technique where each letter in the input message is shifted by a fixed number of positions (commonly by 3) in the English alphabet. This program supports both encryption and decryption using that technique.

more about caesar cipher

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🛠️ Tools & Languages Used

🖥️ Project Requirements

Before you run the program, make sure you have the following :

• A C compiler (e.g., gcc)
• The Make utility (to build the project using a Makefile)
• A terminal or shell environment (macOS, Linux, or Windows using WSL/MinGW)

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🤖 How to Run This On Your Device

First-Time Setup Instructions

(Follow these steps when setting up the project for the first time.)

⒈ Navigate to Desktop (you can clone in any directory)

cd Desktop

⒉ Clone the Repository

git clone https://github.com/manakcodes/caesar-cipher-using-c.git

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🏹 How to Use

(Follow these steps to use the caesar cipher every time.)

⒈Enter the project directory

cd ~/Desktop/caesar-cipher-using-c

⒉ Compile the Source Code Using Makefile

make

⒊ Run the Program

./CaesarCipher

⒋ Clean Build Artifacts (To remove compiled files and reset the project state)

make clean

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🪪 LICENSE

🌲 Project Tree

.
├── LICENSE
├── Main.c
├── Makefile
├── README.md
└── src
    ├── caesar_cipher.h
    ├── crypt.h
    ├── decrypt_caesar.h
    └── encrypt_caesar.h

2 directories, 8 files

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🛸 Project Tree Details

📁 Project Tree Details

• Entry point of the program. Includes all other headers and handles execution flow.

  • Main.c

• Contains global constants, the CaesarCipher struct, and validation helpers.

  • src/caesar_cipher.h

• Implements Caesar Cipher encryption logic.

  • src/encrypt_caesar.h

• Implements Caesar Cipher decryption logic.

  • src/decrypt_caesar.h

• Manages user I/O and CLI interactions, including string input and main crypt logic. - src/crypt.h

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