BIP324 describes an encrypted communication protocol over the Bitcoin P2P network. Encrypted messages offer a number of benefits over plaintext communication, even though the data exchanged over the Bitcoin P2P network is public to some degree. For instance, plaintext message tampering without detection is trivial for a man in the middle (MitM) attacker. Additionally, a nefarious actor may associate metadata such as IP addresses and transaction origins without explicitly having to connect directly to peers. BIP 324 - "V2" - transport forces nefarious observers to actively connect to peers as opposed to passively observing network traffic, and makes packet tampering detectable. Furthermore, V2 messages over TCP/IP look no different from random noise, making Bitcoin P2P packets indistinguishable from other network packets.
The protocol package export the BIP324 library. The proxy package is a small application to enable V2 for V1-only clients.