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It sounds like you really have two problems here: Preventing replay attacks. Preventing the same client from voting twice. These are subtly different. A replay attack is simply sending a request multiple times, perhaps with slight variations, and possibly by a third party. Voting multiple times is just that: legitimately voting more than once. The core ...


Is it feasible to use the table row number where the record is being stored as the salt? (or a function of this unique number). I would store the information on the server, just because as a matter of principle I would NEVER trust the client in Internetland. If you really want to store information on the client you will be digitally signing it or ...

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