Minecraft Clients Req

Hey guys I was just wondering what kind of skills or languages you need to know to make a MineCraft Hack Client. I know you need to know java etc but anything else?

The english language would be best. I guess you could get away with Russian or French though..

Most likely Java and a bit of Unpacking shit.

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Like flameswor10 said it would be java,you should also obfuscate it if your going to sell it.