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POAndroid In App Billing: securing application public key
 

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  1. POAndroid In App Billing: securing application public key
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    <p>From Android In App Billing version 3 (TrivialDrive)sample application coming with sdk</p> <h3>MainActivity.java</h3> <pre><code>/* base64EncodedPublicKey should be YOUR APPLICATION'S PUBLIC KEY * (that you got from the Google Play developer console). This is not your * developer public key, it's the *app-specific* public key. * * Instead of just storing the entire literal string here embedded in the * program, construct the key at runtime from pieces or * use bit manipulation (for example, XOR with some other string) to hide * the actual key. The key itself is not secret information, but we don't * want to make it easy for an attacker to replace the public key with one * of their own and then fake messages from the server. */ String base64EncodedPublicKey = "CONSTRUCT_YOUR_KEY_AND_PLACE_IT_HERE"; </code></pre> <p>Well I am not sure I understand this security measure. I know how to get the application public key (which is already base 64 encoded) from Google Play Developer Console. </p> <p>What I am not understanding is this part</p> <pre><code> /* Instead of just storing the entire literal string here embedded in the * program, construct the key at runtime from pieces or * use bit manipulation (for example, XOR with some other string) to hide * the actual key */ </code></pre> <p>As far as I know, this public key is a constant string, which is given from Google during application upload process. </p> <p>How can we create the same key programmatically using any bit manipulation process? Has someone done it before? Is there any sample code on how to do this?</p>
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    1. COWhy would one hide a *public* key, because, well it's public?
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    2. CO@GameScripting well it is the first question I asked myself.. But I think we are not talking about public key in a key pair (private key/public key pair).. Application public key may be different.. Too bad Google doesn't have much documentation about it especially after they themselves think that it is a security threat..
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    3. CO'A string' XOR 'secret' becomes 'Another string'. 'Another string' XOR the same 'secret' again, it becomes back to 'A string'. That's one XOR use case.
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