File Encryption/Decryption Tool

This project was made for my internship program in HackSecure.

Overview

A secure Python-based GUI application for encrypting and decrypting files using Fernet symmetric encryption. The tool provides an intuitive interface for protecting sensitive files with strong encryption.

Features

• File encryption with AES-256 (Fernet implementation)
• File decryption with proper key authentication
• Key generation functionality
• Modern, user-friendly GUI with Tkinter
• Cross-platform compatibility (Windows, macOS, Linux)
• Secure file handling practices with options to:
  • Remove original file after encryption/decryption
  • Keep original file after encryption/decryption
• Detailed error messages and validation

Requirements

• Python 3.7+
• Packages listed in requirements.txt:
  • cryptography

Installation

1. Clone this repository
2. Create and activate a virtual environment:

   python -m venv venv
   source venv/bin/activate  # Linux/MacOS
   .\venv\Scripts\activate  # Windows

3. Install dependencies:

   pip install -r requirements.txt

Usage

Running the Application

python file_crypt.py

Encrypting a File

1. Select the "Encrypt File" tab
2. Click "Browse" to select ANY file type
3. Choose file handling option (remove or keep original)
4. Enter an encryption key or generate a new one
5. Click "Encrypt File"
6. Choose a location to save the encrypted file (.enc)

Decrypting a File

1. Select the "Decrypt File" tab
2. Click "Browse" to select an encrypted file (.enc)
3. Choose file handling option (remove or keep encrypted file)
4. Enter the correct decryption key
5. Click "Decrypt File"
6. Choose a location to save the decrypted file (with original extension)

Key Management

• Always store your encryption keys securely
• The same key used for encryption must be used for decryption
• Lost keys cannot be recovered - encrypted files will be permanently inaccessible

Screenshots

Encrypt UI

• Options: You can choose to remove or keep the original file after encryption.

Decrypt UI

• Options: You can choose to remove or keep the encrypted file after decryption.

Future Enhancements

• Support for multiple file types
• Drag and drop functionality
• Key export/import functionality
• File hashing verification
• Password-based key derivation

Acknowledgements

• cryptography module for robust encryption implementation
• Python community for excellent documentation