udpobfs -- simple point-to-point UDP obfuscation proxy

This is trivial UDP proxy, that obfuscates UDP traffic between two UDP
ports. Aimed to generate fully pseudorandom traffic indistinguishable
from the noise from the point of the third party observer.

It initiates TLS 1.3 connection between the peers to mutually
authenticate them and agree on shared keying material. After that it
passes traffic on the same port numbers for UDP. There could be multiple
simultaneous sessions alive.

It assures that at least single packet is passed on ten second
intervals. If no (real) traffic is passed for two minutes, then
connections (both TCP and UDP) are closed. Every minute ping/pong
occurs over the TLS channel to keep it alive.

Obfuscated packet is 8 bytes longer, so you have to slightly lower your
MTU in VPN tunnel.

udpobfs is free software: see the file COPYING for copying conditions.