I cracked it!!! I did it…

What is

KBKTOTROZKXGZAXKIXEVZURUMENGYYUSKZOS
KYGXURKZUVRGEOTZNKTOTKZKKTZNIKTZAXEZ
NKGSKXOIGTGAZNUXKJMGXGRRGTVUKCXUZKGY
ZUXEKTZOZRKJZNKMURJHAMOTZNGZYZUXEZNK
RKGJOTMSGTMKZYNURJULGVOKIKULVGXINXKT
ZCOZNGTKTIXEVZKJSKYY

After index of coincidence analysis, I determined that this is a simple cipher.
then I used a frequency analysis… with PERL scripts I wrote and found the key to be 6

so the result is

EVENINLITERATURECRYPTOLOGYHASSOMETIMESAROLETO
PLAYINTHENINETEENTHCENTURYTHEAMERICANAUTHOR
EDGARALLANPOEWROTEASTORYENTITLEDTHEGOLDBUGIN
THATSTORYTHELEADINGMANGETSHOLDOFAPIECEOFPARCHRENT
WITHANENCRYPTEDMESS