[gameprogrammer] Scoreboard functionality across internet

Hey you guys,

I'm thinking of trying to implement a global scoreboard for a game.

The game itself is a standard desktop game where you have the exe and
files needed on your computer (ie its not a web based game or flash or
anything) and the scoreboard i want to reside on a web page.

Doing the web and database thing isn't a problem but I was wondering,
are there any techniques to make this process secure?

I figure what will happen is the game will connect to a database and
send high score data, but of course someone could save this
communication, edit it and replay it so the server said they got
1000000000 points or something.

I know i could do things to make the protocol more obscure such as
obfuscating the code that runs it, and encrypt the packets and maybe
use a public/private key setup but I can't come up with a way to make
it reliably secure.

Is it just that this functionality can't be done securely? Or maybe
someone has some neat techniques? (:

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