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    <p>First, I agree with other answers -- client is absolutely your enemy, and should never be trusted. To also expand on some comments you placed -- even if "EnoughFunds" returns some sort of encrypted token, whats the assure that it wasn't still called by the hacker with amount of 10, and subsequent transfer was activated with amount of 10000000.</p> <p>The approach must be to place atomic business logic together, such as "EnoughFunds and Transfer".</p> <p>I would recommend adding a sequence also, to every server call, so that older server calls can never be re-executed, since they are now out of sequence. Server should return "next sequence token" as some sort of "encrypted" number. This can be as easy just generate random number and return as part of response, while also placing it in server session and reconfirming it on any subsequent call from that client. </p> <p>Again, this trick is not a security measure as much as simply trying to help avoid too easy of a "fiddlering" situation. </p> <p>This can be combined with obfuscating your API. If you call web-services by their name (for ex: EnoughFunds service will be called just that), it is becoming that much easier to reverse engineer. Instead, do something as simple as enumerate services, and go through central controller - activateTask=12?param1=200 . This is still pretty easy to reverse engineer, though... So better if you can invest in encrypting each request altogether, to look like : SFASDFsdq1231sd4DFGTRsdf2rDF </p> <p>And of course any such good request encryption, should be in-part based on the session-id (aka: login authentication token, usually)</p>
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