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I have a simple web-API accessible over HTTP with some corresponding mobile apps reading that data. Now someone decompiled an app / sniffed the HTTP traffic, got the url to my web API and built his own client acting like one of mine.
How can I secure the access to my API only for my own clients? Even with the thought of someone decompiling my app.
Server & client-side code change is an option!
First, you can’t prevent it completely (without legal action :). Use SSL/TLS, that will help with the sniffing posibility.
If the app is downloaded directly from your server (not through an app store/third party) you can secure it a bit more. When a user downloads the application make sure the user is authenticated, generate a key, include it in the application and use it in all further communication with that user. The hacker/thief can mimic that, but they’ll need to go through their server to simulate a login and download of your application — you can find and block that.