▁it ▁will ▁be ▁easy ▁to ▁set ▁up ▁and ▁will ▁improve ▁with ▁every ▁use . ▁The ▁sensor ▁passes ▁a ▁small ▁current ▁through ▁one ' s ▁finger ▁to ▁create ▁a ▁" f inger print ▁map " ▁of ▁the ▁user ' s ▁der mis . ▁Up ▁to ▁ 5 ▁finger print ▁maps ▁can ▁be ▁stored ▁in ▁the ▁Sec ure ▁Enc lave . ▁ ▁Security ▁and ▁priv acy ▁ ▁Touch ▁ID ▁can ▁be ▁by pass ed ▁using ▁pass codes ▁set ▁up ▁by ▁the ▁user . ▁ ▁F inger print ▁data ▁is ▁stored ▁on ▁the ▁secure ▁enc lave ▁inside ▁the ▁Apple ▁A 7 , ▁A 8 , ▁A 8 X , ▁A 9 , ▁A 9 X , ▁A 1 0 , ▁A 1 0 X , ▁A 1 1 , ▁A 1 2 , ▁A 1 3 ▁process ors ▁of ▁an ▁iOS ▁device , ▁and ▁not ▁on ▁Apple ▁servers , ▁nor ▁on ▁i Cloud . ▁From ▁the ▁E fficient ▁Text ure ▁Com parison ▁pat ent ▁covering ▁Apple ' s ▁Touch ▁ID ▁technology : ▁In ▁order ▁to ▁overcome ▁potential ▁security ▁draw back s , ▁Apple ' s ▁in vention ▁includes ▁a ▁process ▁of ▁col laps ing ▁the ▁full ▁maps ▁into ▁a ▁sort ▁of ▁check sum , ▁hash ▁function , ▁or ▁hist ogram . ▁For ▁example , ▁each ▁encrypted ▁r idge ▁map ▁template ▁can ▁have ▁some ▁lower ▁resolution ▁pattern ▁computed ▁and ▁associated ▁with ▁the ▁r idge ▁map . ▁One ▁exempl ary ▁pattern ▁could ▁be ▁a ▁hist ogram ▁of , ▁e . g ., ▁the ▁most ▁common ▁angles ▁( e