Do the authentication over TCP and then fallback to UDP for rest of the communication? For encryption, have you considered DTLS? Read more in `Hybrid Implementa

Do the authentication over TCP and then fallback to UDP for rest of the communication? For encryption, have you considered DTLS? Read more in `Hybrid Implementation` section of http://ithare.com/udp-for-games-security-encryption-and-ddos-protection/ http://ithare.com/udp-for-games-security-encryption-and-ddos...