▁generation , ▁stack ▁buffer ▁overflow ▁protection , ▁security ▁partition ing , ▁role - based ▁access ▁management , ▁and ▁various ▁open - source ▁security ▁tools . ▁ ▁H P ▁class ifies ▁the ▁operating ▁system ' s ▁security ▁features ▁into ▁three ▁categories : ▁data , ▁system ▁and ▁identity : ▁ ▁Context ▁dependent ▁files ▁Release ▁ 6 . x ▁( t ogether ▁with ▁ 3 . x ) ▁introduced ▁the ▁context ▁dependent ▁files ▁( C DF ) ▁feature , ▁a ▁method ▁of ▁allowing ▁a ▁files er ver ▁to ▁serve ▁different ▁configurations ▁and ▁bin aries ▁( and ▁even ▁architect ures ) ▁to ▁different ▁client ▁machines ▁in ▁a ▁heter ogeneous ▁environment . ▁A ▁directory ▁containing ▁such ▁files ▁had ▁its ▁su id ▁bit ▁set ▁and ▁was ▁made ▁hidden ▁from ▁both ▁ordinary ▁and ▁root ▁processes ▁under ▁normal ▁use . ▁Such ▁a ▁scheme ▁was ▁sometimes ▁explo ited ▁by ▁intr ud ers ▁to ▁hide ▁mal icious ▁programs ▁or ▁data . ▁C DF s ▁and ▁the ▁C DF ▁filesystem ▁were ▁dropped ▁with ▁release ▁ 1 0 . 0 . ▁ ▁Support ed ▁hardware ▁platforms ▁ ▁H P - U X ▁operating ▁systems ▁supports ▁a ▁variety ▁of ▁PA - R IS C ▁systems . ▁The ▁ 1 1 . 0 ▁added ▁support ▁for ▁Integr ity - based ▁servers ▁for ▁the ▁transition ▁from ▁PA - R IS C ▁to ▁It an ium . ▁H P - U X ▁ 1 1 i ▁v 1 . 5 ▁is ▁the ▁first ▁version ▁that ▁supported ▁It an ium . ▁On ▁the ▁introduction ▁of ▁H P - U X