E2E LAN Messaging System

Terminal-based messaging app featuring end-to-end encryption, built to explore core concepts in network security.

Protocols Used

Encryption

ChaCha20-Poly1305 is fast, modern, and secure. Uses AEAD (Authenticated Ecryption with Associated Data) and is widely used.

from cryptography.hazmat.primitives.ciphers.aead import ChaCha20Poly1305 

Identify Verification (Message Signatures)

Ed25519 is fast and secure, being widely used in applications such as Signal and OpenSSH. Signs a message before sending with the recipient verifying the signature.

from cryptography.hazmat.primitives.asymmetric.ed25519 import Ed25519PrivateKey, Ed25519PublicKey

LAN Transport

UDP Multicast is serverless, allowing users to deliver messages to all users on LAN (P2P Architecture).