Challenge 1 - Substitution Cipher


The following ciphertext has been encrypted using a substitution cipher. The encryption key of a substitution cipher is a random permutation of the plaintext's alphabet(in this case: the 26 letters of the latin alphabet). Encryption is done by substituting every character of the plaintext with the corresponding character from the key. The plaintext is, apart from the random flag, written in english language.

Your Ciphertext:

UM ARHFEOKRZFQH Z DLCDEUELEUOM AUFQSR UD Z YSEQOV OW SMARHFEUMK CH NQUAQ LMUED OW FGZUMESPE ZRS RSFGZASV NUEQ AUFQSRESPE ZAAORVUMK EO Z WUPSV DHDESY EQS LMUED YZH CS DUMKGS GSEESRD EQS YODE AOYYOM FZURD OW GSEESRD ERUFGSED OW GSEESRD YUPELRSD OW EQS ZCOIS ZMV DO WOREQ EQS RSASUISR VSAUFQSRD EQS ESPE CH FSRWORYUMK EQS UMISRDS DLCDEUELEUOM DLCDEUELEUOM AUFQSRD AZM CS AOYFZRSV NUEQ ERZMDFODUEUOM AUFQSRD UM Z ERZMDFODUEUOM AUFQSR EQS LMUED OW EQS FGZUMESPE ZRS RSZRRZMKSV UM Z VUWWSRSME ZMV LDLZGGH TLUES AOYFGSP ORVSR CLE EQS LMUED EQSYDSGISD ZRS GSWE LMAQZMKSV CH AOMERZDE UM Z DLCDEUELEUOM AUFQSR EQS LMUED OW EQS FGZUMESPE ZRS RSEZUMSV UM EQS DZYS DSTLSMAS UM EQS AUFQSRESPE CLE EQS LMUED EQSYDSGISD ZRS ZGESRSV EQSRS ZRS Z MLYCSR OW VUWWSRSME EHFSD OW DLCDEUELEUOM AUFQSR UW EQS AUFQSR OFSRZESD OM DUMKGS GSEESRD UE UD ESRYSV Z DUYFGS DLCDEUELEUOM AUFQSR Z AUFQSR EQZE OFSRZESD OM GZRKSR KROLFD OW GSEESRD UD ESRYSV FOGHKRZFQUA Z YOMOZGFQZCSEUA AUFQSR LDSD WUPSV DLCDEUELEUOM OISR EQS SMEURS YSDDZKS NQSRSZD Z FOGHZGFQZCSEUA AUFQSR LDSD Z MLYCSR OW DLCDEUELEUOMD ZE VUWWSRSME FODUEUOMD UM EQS YSDDZKS NQSRS Z LMUE WROY EQS FGZUMESPE UD YZFFSV EO OMS OW DSISRZG FODDUCUGUEUSD UM EQS AUFQSRESPE ZMV IUAS ISRDZ FZH DFSAUZG ZEESMEUOM EO EQS JSH UE UD MOE ZGNZHD FODDUCGS EO VSRUIS Z AOYFGSES YZFFUMK OW AQZRZAESRD UW EQS FGZUMESPE VOSD MOE AOMEZUM ZGG AQZRZAESRD OW EQS ZGFQZCSE EQS ZCOIS TLOES WROY NUJUFSVUZ VOSD MOE AOMEZUM EQS GSEESRD XJB WOR SPZYFGS ZVVUEUOMZGGH QSRS UD HOLR WGZK EO DLCYUE PKYEXSSAMVJKVEHFXHFUOOUQQPTZVSOG

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