🛡️ Secure File Transfer Tool

A secure, client-side encrypted file transfer web app built with Python and Flask. Think “mini WeTransfer” but with
hacker-grade protection: every file is encrypted using AES before upload and decrypted only after download.

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⚙ Features

• 🔐 Client-side AES encryption using cryptography.fernet
• 📤 Upload & encrypt any file (images, PDFs, docs, zips, etc.)
• 📥 Decrypt & download encrypted .enc files back to their original form
• 🧠 Stylish hacker-inspired UI with Matrix aesthetics
• 💾 File integrity via .key file + Flask routes
• 🔐 Secure folder storage for original, encrypted, and decrypted assets

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🧠 Skills Demonstrated

• Flask web routing
• AES encryption (Fernet)
• File I/O in Python
• Secure file handling logic
• Frontend + backend integration
• Cyber-themed UI/UX

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⚡️ Local, fast, and easy to run

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📸 Screenshot

🧪 Tech Stack

Layer	Tech Used
Backend	Python 3.11, Flask
Encryption	AES (Fernet - cryptography)
Frontend	HTML, inline CSS
UI Theme	Hacker/Cyberpunk Matrix style

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📁 Folder Structure

secure-file-transfer/
│
├── static/                # Logo assets, CSS if needed
├── templates/             # HTML (index.html)
├── uploads/               # Raw uploaded files
├── encrypted/             # AES encrypted versions
├── decrypted/             # Final decrypted files
├── encryption_utils.py    # Core AES logic
├── generate_key.py        # One-time key generation
├── app.py                 # Flask server logic
├── filekey.key            # 🔐 Auto .gitignored
├── requirements.txt       # Dependencies
└── README.md              # This file

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🚀 Getting Started

• Clone & Activate Environment

git clone https://github.com/DecryptMike/Secure-File-Transfer.git
cd Secure-File-Transfer
python3 -m venv venv
source venv/bin/activate

• Install Requirements

pip install -r requirements.txt

• Generate Encryption Key (Run Once)

python generate_key.py

This creates a filekey.key (auto .gitignored) — keep this safe!

• Launch the Web App

python app.py

• Then visit: http://127.0.0.1:5000

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🌐 How It Works

1. User uploads a file → it’s encrypted client-side with AES.
2. App stores .enc version in /encrypted
3. Download & send .enc file
4. Recipient uploads it back → file is decrypted only with matching key

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💡 Why I Built It

To demonstrate real-world cybersecurity fundamentals — encryption, secure file transfer, and web-based automation. It’s also a perfect portfolio piece for recruiters to showcase Flask + encryption + frontend integration in a clean, branded UI.

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⚠️ Disclaimer

This project is for educational use only. Do not use this in production without enhancements such as:

• Authenticated sessions
• Key rotation
• Secure HTTPS hosting

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💻 Built by @DecryptMike

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