iOS Game - how to secure server side resurces

[naveen0403 () yahoo com]

Hi
I recently joined a company which is developing a game/app for iOS. Game needs some intensive server side processing. 
Also, they want the game to be popular as soon as possible so there are no security requirements to sign up or set up a 
user account(userid/pwd). They just want user to download and start playing. 
How do you secure server resources(say REST services) in this environment? Every approach i think of, has a security 
flaw, because fundamentally anything you store on client side(hardcode in code or config files, encryption keys etc) to 
communicate with server side resources, it can be retrieved.
May be I am missing something fundamental. Any help is appreciated.
Thanks
Naveen

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