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    <p>What you are describing is bi-directional authentication. It can only be done by storing a signed public key (certificate) on boths sides of the communication. Meaning that each app would need to authenticate your server with your servers public key and the server would need to authenticate each instance of your app. The app's public key would need to be produced and stored on the server at the deployment time with each instance of your app. Think of this as 2 way HTTPS, in general the only authentication that needs to be done is one direction, with the browser authenticating the server with a trusted signing key. In your case this would need to be done on both sides. Normally you would have a service like VeriSign sign each instance of a public key, this can get quite spendy with multiple deployments of an app. In your case you could just create an in house signing application using something like OPENSSL to sign your app every time it is distributed. This does not mean that someone still could not hack your code and extract the signing key on the app side. In general any code can be hacked, it's just a question of how hard can you make it before they give up? If you were to go the custom hardware route, there are things such as crypto chips and TMP's that can serve as a key sotre and make it harder for people to gain access to the private keys on the device.</p> <p>A quick google search turned up the following:</p> <p><a href="http://www.codeproject.com/Articles/326574/An-Introduction-to-Mutual-SSL-Authentication" rel="nofollow">http://www.codeproject.com/Articles/326574/An-Introduction-to-Mutual-SSL-Authentication</a></p> <p>If you are thinking about using rewards points, and are really worried about someone gaming the system from the outside a better solution is to have each person make an account that is stored securely on the server and their points are saved and tallied there. This centralizes all the data and allows you complete control over it with out worrying about a malicious app reporting non-existent points. (this is how banks work)</p>
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    1. POHow to validate the origin of a web service invokation
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    1. USJimmy Johnson
    1. USJimmy Johnson
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    1. COThanks for your answer. Okay this looks promising. There must be a standart "way to do it" can you share any lecture resources?
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      1. USAdrian Salazar
    2. COI added a link in the answer
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