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    <blockquote> <p>"Now I have come to accept the fact that there is no way on earth I can hide this from a hacker and send the scores unaltered."</p> </blockquote> <p><strike> Oh yes, there is!</p> <p>You can use RSA or any other public key encryption method (also called assymetric cryptography).</p> <p>Create a set of (public and private) keys for the server. Have your client code include your server's public key.</p> <p>At the end of the game, the client code, encrypts the score (with this key) and sends both (plain score and encrypted score) to server.</p> <p>Server decrypts and checks if plain score and decrypted one are same. If yes, accept score. If not, reject (there's a hacker or network error in the middle). </strike></p> <p>-------UPDATE-----------CORRECTION--------------</p> <p>As Ambrosia, pointed out, my approach fails completely with this kind of attack.</p> <p>What you actually want is to have a trusted result from a calculation (of score) made by an untrusted party (the player). No easy way to achieve this.</p> <p>See this: <a href="http://coltrane.wiwi.hu-berlin.de/~fis/texts/2003-profit-untrust.pdf" rel="nofollow">http://coltrane.wiwi.hu-berlin.de/~fis/texts/2003-profit-untrust.pdf</a></p> <p>Also this one: <a href="http://www.cse.psu.edu/~snarayan/publications/securecomputation.pdf" rel="nofollow">http://www.cse.psu.edu/~snarayan/publications/securecomputation.pdf</a></p> <p>And this (which needs a subscription to the ACM digital library): <a href="http://portal.acm.org/citation.cfm?id=643477.643479" rel="nofollow">http://portal.acm.org/citation.cfm?id=643477.643479</a></p>
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    1. POSafest way to update game score from client to server database? Javascript
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    1. CO"don't want my server to perform complex decryption algorithm"
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    2. COYes, right. And "achieve considerable amount of security" on the same sentence. Pretty contradicting, aren't they?
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    3. COPlus don't I have to pay like money to use RSA? I though you needed to purchase those keys?
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