Secure score submit?

Hi everybody,
I’m building a flash-game-site for a while. The big trouble is Secure Score Submitting System :stuck_out_tongue:

I search on the net and find some ineffective techniques:
-Secret word method: there is an secret word (crypto pass) on the server and flash gets it from server and uses for crypting score data then sends it to server. But the algoritm that does the crypto job, can be accesible with a swf decompiler. Also getting the secret word from server outside of flash is simple. Not safe!
-HTTP_REFERER method: php (or what else) check HTTP_REFERER data to determine where the post coming from. But with a simply firefox extensions, the referer header can be changed. Not safe!

That is my own idea but can only make cracking harder, not more:
-We can get flash vars with js (:swliveconnect) and send to server. Flash just make a fake submit that makes no effect. Just a trick. But not safe!

I think there must be a way and someone must know it on kirupa :slight_smile:
Waiting for any help…