... sent in each packet, the sender can deduce which segments need to be retransmitted. Encryption. AES-GCM-256 per packet, Curve25519 for key exchange and cert signatures. The details for shared key derivation and per-packet IV are based on the design used by Google's QUIC protocol. This library has shipped on consoles, mobile platforms, and non-Steam stores, and has been used to facilitate cross-platform connectivity. Contact us to get access to the code.