Please use the search guys, this has been discussed in many threads all over here and the general section ever since 4.3 was released.
Currently, the only way to root after you have already flashed 4.3 is to unlock your bootloader and flash DooMLoRD's advanced stock kernel.
That's it, until somebody finds a way to root with a locked bootloader and that doesn't mean you have to post asking for it. Once someone has a breakthrough, they will publish their work here for certain.
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