VortexConn protocol

S = Server (Listener)
C = Client

On connection establishment:

S -> C

[Server's public key]

C -> S (simultaneously)

[Client's public key]

S -> C

[Server-generated 32-byte AES256 key encrypted with Client's public key][16 securely random bytes (will be the IV)]

The client initializes an AES stream with the received key and IV. The server does the same. Now both have the same key and IV and can begin sending encrypted messages.