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Let’s say I’m making an HTML5 game using JavaScript and the <canvas> The varaibles are stored in the DOM such as level, exp, current_map, and the like.
Obviously, they can be edited client-side using Firebug. What would I have to do to maximize security, so it would be really hard to edit (and cheat)?
Don’t store the variables in the DOM if you wish a reasonable level of security. JavaScript, even if obfuscated, can easily be reverse engineered. That defeats any local encryption mechanisms.
Store key variables server-side and use https to maximize security. Even so, the client code (JavaScript) is quite vulnerable to hacking.