substitution2

https://play.picoctf.org/playlists/12?m=80

isnfnnpctitnznfmxhisnfwnxxntimjxctsnascdstushhxuhgqbinftnubfciruhgqnicichktckuxbackdurjnfqmifchimkabturjnfusmxxnkdnisntnuhgqnicichktehubtqfcgmfcxrhktrtingtmagckctifmichkebkamgnkimxtwscusmfnznfrbtnebxmkagmfonimjxntocxxtshwnznfwnjnxcnznisnqfhqnfqbfqhtnhemscdstushhxuhgqbinftnubfciruhgqnicichkctkhihkxrihinmuszmxbmjxntocxxtjbimxthihdnitibankitckinfntinackmkanpucinamjhbiuhgqbinftucnkunanenktcznuhgqnicichktmfnheinkxmjhfchbtmeemcftmkauhgnahwkihfbkkckdusnuoxctitmkanpnubickduhkecdtufcqitheenktnhkisnhisnfsmkactsnmzcxrehubtnahknpqxhfmichkmkacgqfhzctmichkmkaheinksmtnxngnkitheqxmrwnjnxcnznmuhgqnicichkihbusckdhkisnheenktcznnxngnkitheuhgqbinftnubfcirctisnfnehfnmjniinfznscuxnehfinusnzmkdnxctgihtibankitckmgnfcumkscdstushhxtebfisnfwnjnxcnznismimkbkanftimkackdheheenktczninuskcvbntctnttnkicmxehfghbkickdmkneenuicznanenktnmkaismiisnihhxtmkauhkecdbfmichkehubtnkuhbkinfnackanenktcznuhgqnicichktahntkhixnmatibankitihokhwisncfnkngrmtneenuicznxrmtinmusckdisngihmuicznxrisckoxconmkmiimuonfqcuhuiectmkheenktcznxrhfcnkinascdstushhxuhgqbinftnubfciruhgqnicichkismitnnotihdnknfminckinfntickuhgqbinftucnkunmghkdscdstushhxnftinmusckdisngnkhbdsmjhbiuhgqbinftnubfcirihqcvbnisncfubfchtcirghiczmickdisngihnpqxhfnhkisncfhwkmkankmjxckdisngihjniinfanenkaisncfgmusckntisnexmdctqcuhUIE{K6F4G_4K41R515_15_73A10B5_702E03EU}

• same as [[substitution1]] and [[substitution0]]

• use [[Cryptography#^1610d4]], we get message

THEREEXISTSEVERALOTHERWELLESTABLISHEDHIGHSCHOOLCOMPUTERSECURITYCOMPETITIONSINCLUDINGCYBERPATRIOTANDUSCYBERCHALLENGETHESECOMPETITIONSFOCUSPRIMARILYONSYSTEMSADMINISTRATIONFUNDAMENTALSWHICHAREVERYUSEFULANDMARKETABLESKILLSHOWEVERWEBELIEVETHEPROPERPURPOSEOFAHIGHSCHOOLCOMPUTERSECURITYCOMPETITIONISNOTONLYTOTEACHVALUABLESKILLSBUTALSOTOGETSTUDENTSINTERESTEDINANDEXCITEDABOUTCOMPUTERSCIENCEDEFENSIVECOMPETITIONSAREOFTENLABORIOUSAFFAIRSANDCOMEDOWNTORUNNINGCHECKLISTSANDEXECUTINGCONFIGSCRIPTSOFFENSEONTHEOTHERHANDISHEAVILYFOCUSEDONEXPLORATIONANDIMPROVISATIONANDOFTENHASELEMENTSOFPLAYWEBELIEVEACOMPETITIONTOUCHINGONTHEOFFENSIVEELEMENTSOFCOMPUTERSECURITYISTHEREFOREABETTERVEHICLEFORTECHEVANGELISMTOSTUDENTSINAMERICANHIGHSCHOOLSFURTHERWEBELIEVETHATANUNDERSTANDINGOFOFFENSIVETECHNIZUESISESSENTIALFORMOUNTINGANEFFECTIVEDEFENSEANDTHATTHETOOLSANDCONFIGURATIONFOCUSENCOUNTEREDINDEFENSIVECOMPETITIONSDOESNOTLEADSTUDENTSTOKNOWTHEIRENEMYASEFFECTIVELYASTEACHINGTHEMTOACTIVELYTHINKLIKEANATTACKERPICOCTFISANOFFENSIVELYORIENTEDHIGHSCHOOLCOMPUTERSECURITYCOMPETITIONTHATSEEKSTOGENERATEINTERESTINCOMPUTERSCIENCEAMONGHIGHSCHOOLERSTEACHINGTHEMENOUGHABOUTCOMPUTERSECURITYTOPIZUETHEIRCURIOSITYMOTIVATINGTHEMTOEXPLOREONTHEIROWNANDENABLINGTHEMTOBETTERDEFENDTHEIRMACHINESTHEFLAGISPICOCTF{N6R4M_4N41Y515_15_73D10U5_702F03FC}