Challenge - Substitution Cipher

Der folgende Ciphertext wurde mit einem "substitution cipher" verschlüsselt. Der Verschlüsselungscode einer Substitutionsverschlüsselung ist eine zufällige Permutation des Klartextalphabets (in diesem Fall: die 26 Buchstaben des lateinischen Alphabets). Die Verschlüsselung erfolgt, indem jedes Zeichen des Klartextes durch das entsprechende Zeichen aus dem Schlüssel ersetzt wird. Der Klartext ist, abgesehen von der Flag, in englischer Sprache geschrieben.

TH OQANJUDQKNCA K ISLIJTJSJTUH OTNCBQ TI K XBJCUE UG BHOQANJTHD LA ZCTOC SHTJI UG NPKTHJBYJ KQB QBNPKOBE ZTJC OTNCBQJBYJ KOOUQETHD JU K GTYBE IAIJBX JCB SHTJI XKA LB ITHDPB PBJJBQI JCB XUIJ OUXXUH NKTQI UG PBJJBQI JQTNPBJI UG PBJJBQI XTYJSQBI UG JCB KLUVB KHE IU GUQJC JCB QBOBTVBQ EBOTNCBQI JCB JBYJ LA NBQGUQXTHD JCB THVBQIB ISLIJTJSJTUH ISLIJTJSJTUH OTNCBQI OKH LB OUXNKQBE ZTJC JQKHINUITJTUH OTNCBQI TH K JQKHINUITJTUH OTNCBQ JCB SHTJI UG JCB NPKTHJBYJ KQB QBKQQKHDBE TH K ETGGBQBHJ KHE SISKPPA WSTJB OUXNPBY UQEBQ LSJ JCB SHTJI JCBXIBPVBI KQB PBGJ SHOCKHDBE LA OUHJQKIJ TH K ISLIJTJSJTUH OTNCBQ JCB SHTJI UG JCB NPKTHJBYJ KQB QBJKTHBE TH JCB IKXB IBWSBHOB TH JCB OTNCBQJBYJ LSJ JCB SHTJI JCBXIBPVBI KQB KPJBQBE JCBQB KQB K HSXLBQ UG ETGGBQBHJ JANBI UG ISLIJTJSJTUH OTNCBQ TG JCB OTNCBQ UNBQKJBI UH ITHDPB PBJJBQI TJ TI JBQXBE K ITXNPB ISLIJTJSJTUH OTNCBQ K OTNCBQ JCKJ UNBQKJBI UH PKQDBQ DQUSNI UG PBJJBQI TI JBQXBE NUPADQKNCTO K XUHUKPNCKLBJTO OTNCBQ SIBI GTYBE ISLIJTJSJTUH UVBQ JCB BHJTQB XBIIKDB ZCBQBKI K NUPAKPNCKLBJTO OTNCBQ SIBI K HSXLBQ UG ISLIJTJSJTUHI KJ ETGGBQBHJ NUITJTUHI TH JCB XBIIKDB ZCBQB K SHTJ GQUX JCB NPKTHJBYJ TI XKNNBE JU UHB UG IBVBQKP NUIITLTPTJTBI TH JCB OTNCBQJBYJ KHE VTOB VBQIK NKA INBOTKP KJJBHJTUH JU JCB MBA TJ TI HUJ KPZKAI NUIITLPB JU EBQTVB K OUXNPBJB XKNNTHD UG OCKQKOJBQI TG JCB NPKTHJBYJ EUBI HUJ OUHJKTH KPP OCKQKOJBQI UG JCB KPNCKLBJ JCB KLUVB WSUJB GQUX ZTMTNBETK EUBI HUJ OUHJKTH JCB PBJJBQI FMR GUQ BYKXNPB KEETJTUHKPPA CBQB TI AUSQ GPKD JU ISLXTJ GMKUCBOOFMUDRQSNWUYYRGMIZLHQZTNP