🔐 Secure Messenger HALO

HALO is an end-to-end encrypted chat application that allows users to exchange private messages with verified authenticity.

The project combines modern cryptographic techniques to ensure:

• 🔒 Confidentiality (no one but the recipient can read the message),

• ✅ Authenticity (messages are signed and verified),

• 🛡 Integrity (any tampering is immediately detected).

✨ Key Features:

Asymmetric encryption using Elliptic Curve Cryptography (ECC)

Digital signatures using DSA (Digital Signature Algorithm)

WebSocket-based server with FastAPI for real-time communication

Multiple clients: terminal interface & GUI (PyQt6)

User presence & key exchange handled through the server

Friendly and lightweight UX

🔍 Why ECC + DSA?

Compared to traditional algorithms like RSA, ElGamal, and Rabin, ECC offers faster performance, smaller key sizes, and stronger security per bit. DSA complements it by adding a layer of identity verification, ensuring that messages cannot be forged.

💡 Use Case

Imagine two people communicating over the internet. HALO Messenger ensures that:

Only the intended recipient can read the message

The sender is who they claim to be

No one can alter the message silently

Before you start - download all the requested libs.

pip install -r requirements.txt

Now run this in your terminal:

python client.py

or

python3 client.py

🙏 Credits

🧾 Responsibility	✨ Contributor
📐 ECC development	Vlad
✍️ DSA development	Iia
💆 Messenger logic	Vlad & Iia