Features of relay libp2p node

protocol using => Circuit relay protocol Features of Relay node

NOISE PROTOCOL When two libp2p peers connect:

libp2p checks which security protocols both support (Noise, TLS, etc.). They agree to use Noise. noise.New runs → performs a Noise handshake (like the XX pattern by default). They exchange keys → derive a shared session key. From now on, all traffic is encrypted & authenticated using that key.

Why Noise here?

It’s lightweight compared to TLS. Provides forward secrecy and identity protection. Standard in many peer-to-peer systems (WireGuard(vpn SERVICE), libp2p, etc.).

WHY USING WEBSOCKET TRANSPORT LAYER?

CIRCUIT RELAY PROTOCOL

RSA as public-key cryptography algorithm To generate an RSA PEM(privacy-enhanced mail) key pair, we need to follow these steps:

Generate a new RSA private key. Encode the private key to the PEM format. Extract the public key from the private key. Encode the public key to the PEM format.

Main point: libp2p uses its own crypto insterface hence we need to convert RSA private key to libp2p format rsa.PrivateKey = pure cryptographic key. crypto.PrivKey = same key, but in a wrapper that libp2p understands and can operate with.

Marshal = “marshal” means to convert a data structure into a format that can be stored or transmitted.

Marshal → DER → crypto.UnmarshalRsaPrivateKey is necessary to convert your standard RSA key into libp2p’s crypto.PrivKey