🔐 Zip File Encryption and Decryption using AES

This project provides Python scripts to compress a directory into a zip file and encrypt it using AES-256 encryption. The generated AES key must be securely stored for future decryption.

📋 Requirements

Make sure you have the following Python package installed:

pip install cryptography

📁 Files

• 🔐 encrypt_zip.py: Script to zip a directory and encrypt it using AES-256 encryption.
• 🔓 decrypt_zip.py: Script to decrypt an encrypted zip file using the AES key and IV (Initialization Vector).
• 📄 README.md: Documentation on how to use the project.

🚀 How to Use

1️⃣ Encrypting a Zip File

1. Open the encrypt_zip.py script and specify the path of the directory you want to zip:

   directory_to_zip = r"E:\path\to\your\directory"  # Replace with the actual directory path

2. Run the script to:

   • Compress the specified directory into a zip file.
   • Generate a 256-bit AES key and a random IV (Initialization Vector).
   • Encrypt the zip file using AES in CBC mode.

3. Once the encryption is complete, the AES key and IV will be printed in hexadecimal format. Save these securely! The encrypted file will be saved as encrypted_output.bin.

📋 Example Output:

🔑 AES Key (keep this safe!): d9f8e12c2a3e9d0aebbff6d7c78f6a1f6c4c0e9e7f2e5e8b11b17ff72a8e5237
🔑 IV: 3dcb5671dba8bcfb07e2f5686cfa88c1
The zip file has been encrypted and saved as encrypted_output.bin

4. Important: Save the AES key and IV as they are necessary to decrypt the file.

🏃‍♂️ Run the Script:

python encrypt_zip.py

2️⃣ Decrypting the Zip File

1. Open the decrypt_zip.py script.

2. Replace the placeholder your_aes_key_here with the AES key you obtained during encryption. For example:

   aes_key = bytes.fromhex('d9f8e12c2a3e9d0aebbff6d7c78f6a1f6c4c0e9e7f2e5e8b11b17ff72a8e5237')  # Replace with your actual AES key

3. Run the script, and the decrypted zip file will be saved as decrypted_output.zip. You can then extract it using any zip extraction tool.

🏃‍♂️ Run the Script:

python decrypt_zip.py

⚠️ Important Notes

• 🔑 AES Key Security: The AES key is required for decryption. Store it in a secure place, as it cannot be recovered if lost.
• 🔒 IV (Initialization Vector): The IV is saved in the encrypted file and used for decryption.
• 🔐 Encryption Algorithm: The scripts use AES-256 in CBC mode, a symmetric encryption algorithm. The same AES key and IV must be used for decryption.

🛠️ Example Workflow

1. Encrypt a directory:

   python encrypt_zip.py

2. Decrypt the encrypted file:

   python decrypt_zip.py

✨ Customization

• 📂 Custom Output Locations: Modify the output paths in the scripts for the zip, encrypted, and decrypted files.
• 📁 Directory Paths: Replace the default paths in the scripts with the locations of your own directories.

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💻 Created by Akshaykumar Nayee 👨‍💻