ECDH Key Exchange for Secure Encryption Key Generation

1. Key Pair Generation on Each Node:

   • Each node generates a private-public key pair using Elliptic Curve Diffie-Hellman (ECDH). The private key is kept secure on the node, while the public key is shared with Unity Network’s central server.

2. Public Key Sharing:

   • Each node sends its serialized public key to Unity Network’s central server over a secure communication channel (e.g., HTTPS or TLS). The central server will use this to establish the shared key.

3. Central Server Key Pair Generation:

   • Unity Network’s central server also generates its own private-public key pair using ECDH. It shares its public key with each node, allowing both sides to compute a shared secret key.

4. Shared Secret Key Computation:

   • Each node and the central server use their respective private keys and the other’s public key to compute a shared secret key. This shared secret will be used to derive a symmetric encryption key for securing the model updates.

5. Symmetric Encryption Key Derivation:

   • The shared secret key is passed through a Key Derivation Function (KDF) to produce a symmetric encryption key. This key is unique to each node-server pair, ensuring that updates are securely encrypted before transmission.