🔐 Encoder-Decoder File (SecureVault)

A lightweight and secure web application that allows users to encrypt and decrypt any file using a custom key. All operations are done client-side (in browser) or securely handled on the backend, ensuring your sensitive data remains protected.

Live Preview💻

🖼️ UI Preview

🚀 Features

• 🔑 Custom Key Encryption – Encrypt your file using your own secret key.
• 🔓 Decryption with or without key – If encryption was done without a key, decryption won't require one.
• 🧠 Simple UI/UX – Built for speed and usability.
• 📂 Supports All File Types – PDF, DOCX, MP4, PNG, TXT, etc.
• 🔐 AES-256-CBC Encryption – Strong and secure industry-standard encryption.
• 💻 Backend-Powered Security – Secure operations handled using Node.js & Crypto module.

🛠️ Tech Stack

Layer	Technology
Frontend	React.js, Tailwind CSS
Backend	Node.js, Express.js
Database	MongoDB (via Mongoose)
Crypto	AES-256-CBC via Node.js crypto
UUID	uuid for file identifiers

📥 How to Use

🔧 Step 1: Clone the Repository

// Step 1:
git clone https://github.com/deepakcode21/file-cryptography-encryption.git
cd encoder-decoder-file

// Step 2:
cd server
node server.js

// Step 3:
cd client
npm run dev

🔐 Step 3: Encrypt a File

• Upload your file
• Enter a custom key (or skip if you want non-key encryption)
• Click Encrypt
• Your encrypted file will be ready for download

🔓 Step 4: Decrypt a File

• Upload an encrypted file
• Enter the same key used during encryption (or skip if it was encrypted without key)
• Click Decrypt
• The original file will be available for download

🚀 Deployment

Host instantly on: Deploy on Vercel

🛡️ Security Note

Uses AES-256-CBC with secure key derivation (PBKDF2 + salt + IV)

• Files are encrypted with a combination of:
• Random salt (to derive the key) -- Random iv (for cipher variation) -- Only encrypted data + metadata is stored. Your actual file is never exposed.
• Files are never shared publicly or stored insecurely

⚠️ Important: Always test the encryption/decryption process with dummy data before using it for critical files. The author is not responsible for any data loss.

🤝 Contributing

Pull requests are welcome! If you have suggestions for improvements or want to add new features (drag & drop, file history, etc.), feel free to open an issue or PR.

📄 License

This project is licensed under the MIT License.

Made with ❤️ by Deepak (ArrowMax)