How can I make sure the data that people send to GameCenter (like score, and peer data exchange) is not tampered with? That is, the network data comes from securely stored data (e.g. using SQLCiphier), and is not modified midway? Is this impossible without a custom server side implementation?
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Invaiarbly you will encounter a CWE-602: Client-Side Enforcement of Server-Side Security violation. So the answer is no, you can’t stop this.