Encryptify

Encryptify is a desktop application for securely encrypting and decrypting any type of file using a password.
It uses AES-256-GCM along with PBKDF2-HMAC-SHA256 to ensure strong encryption, integrity protection, and safe password-based key generation.
The interface is built with CustomTkinter for a clean and modern UI.

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🔐 Features

File Encryption

• AES-256-GCM encryption
• Random salt + nonce generated for every file
• Protects against modification and wrong password attempts
• Appends metadata to store the original file extension
• Outputs encrypted files as .efy (custom extension)

File Decryption

• Automatically restores the original extension (e.g., .png, .mp4, .pdf)
• Fails safely if password is wrong
• Works on all file types since everything is handled in binary

Modern GUI

• Built with CustomTkinter
• Dark mode
• Easy file path and password inputs
• Dynamic mode switch: Encryption ↔ Decryption
• Success and error messages

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🛠️ How It Works

1. Key Derivation:
   Uses PBKDF2-HMAC-SHA256 to derive a 32-byte key from the password.
   A random salt (16 bytes) ensures unique keys even for identical passwords.

2. Encryption:
   AES-GCM uses a random nonce (12 bytes) to encrypt the file.

3. Output Format:
   [salt][nonce][extension_length][extension][ciphertext]

4. AES-GCM Guarantees:

• Confidentiality
• Integrity
• Authenticity (wrong password = TagError)

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📁 Project Structure

• user_interface.py — Handles the GUI and calls logic functions.
• logic.py — Handles encryption, decryption, metadata extraction, salt/nonce, and file reconstruction.

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🧪 What I Learned

• AES-GCM encryption and authentication
• Using salts, nonces, and key derivation for security
• Binary file handling in Python
• Designing GUIs with CustomTkinter
• Structuring multi-file Python applications
• Building and packaging Python apps

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▶️ How to Run

Option 1 — Run the EXE

Download the precompiled .exe file from the releases page and simply run it.
(No installation required.)

Option 2 — Run the Source Code

pip install cryptography customtkinter
python user_interface.py

🚧 Possible Improvements

• Drag-and-drop file support
• Folder encryption
• Progress indicator
• Themes (light/dark toggle)
• Password strength meter
• "Remember last file" option

If you find Encryptify useful, please consider giving it a ⭐ on GitHub! Your support is greatly appreciated.

📜 License

This project is licensed under the MIT License — free to use, modify, and distribute.