Thanks for the tutorial, it worked !
I'm on stock 4.4.2 Baseband n7100xxufnd3 Buildnumber KOT49H.N7100XXUFNE1 and CFC=XEF
I used the last version of philz_touch : philz_touch_6.48.4-n7100.tar
and the version of SuperSu: UPDATE-SuperSU-v2.35.zip
Of course, the knox became 0x1 but i don't care because the warranty is expired since january.
A special thank to Wout2426
because without his post
(which concerns the same firmware version as that i have) and his answers, I would not have done it because I had seen too many failed cases on the web.