I wondered about and did worry about hacking/cheating etc. But if someone does cheat (using Fritz Rybeka whatever) or changes packets they get nothing from it do they? They don't get better at chess. Personally I can and do hack a lot of networks, computers etc. But here, its not worth it. What is the motivation?
Since I've been playing I haven't had any opponents I even suspected of cheating nor has anyone called me a cheater. For they time being, its a non-problem IMNSHO.

Well said TheGrobe.