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Munitions Building, Washington D.C. December 16, 1943 Dear young cryptanalysts, Recently the Japanese changed the wiring of their Purple machine. We were able to reconstruct it but it took us a very long time. I ask you to find new, faster methods to be able to reconstruct the wiring if unfortunately it had to be changed again. The last message you had to solve is not realistic, it was over 5000 characters. It is very rare for the Japanese to send messages longer than 700 characters. This one is more realistic. It consists of a message in several parts. In this case, it is common for the different parts to be in depth (this simplifies the work of the cipher clerk). The punctuation marks and the numbers are translated into words (for example, 3=three). It should also be noted that the words are separated by the letter Z. The subject of the messages concerns the War of Independence for the year 1776. The beginning is stereotyped (but there may be inversions: TO...FROM; PART ...FROM ... , MSG NUMBER in place of MESSAGE). In the case of genuine messages, we can determine the numbers because we maintain a catalog to save them. The supposed beginning of the first message: „FROM Z WASHINGTON Z TO Z
ALL Z ARMIES Z STOP Z MESSAGE Z FOUR Z THREE
Z NINE Z FIVE Z STOP Z PART Z ONE Z
SLASH Z FOUR Z STOP Z” You will be helped by the fact that the Japanese have not changed their indicator system. Here is the message key we used: motion: 123, Sixes: 5, Twenties: 5,5,5 and cipher mode. Good luck! Frank Byron Rowllet 1st message JKITG KJVKO
YESOW ZNGZX ACISJ RZUYG QMEWZ FZRWM IGOYI ILIWV XGUOD UHOIS
UWUIX AOQZP HMYEO JGECJ XHSIJ GODIB NODZP CZIAP EQOCV HWGDE
CIZHU BODVI BOERU WXSWQ IUWUZ MZNEC ZLGXQ HOQUV NUDEW OEMWE
EKZJY GDICF PEETU GCELE VVSUB RZAIM UZUFB ROWCO ROJBO PEZUU
TEUIK DYPUA ZMEDU KZJIF FGHIQ UCGWF VTOTI ENGMU NUBKG BUTCQ
EYLEP UUAIG VPNET XNNAO NEJWE EWQZF GXHZN GVAOP BOWCR ZAGTN
IUFQS HUGCG BIVNO LOAKE SEETE EIVIL MGOTD OKZKY ZUWWO NFIFE
JUFCB ZNGZS GLGWU QAXDN PNGZB EQZXW FNRZP UWBPU NUEKS HWGNE
UKDOD DGDIP TSIHX GDETS ZENUL EHZGV DUNNM OYGES KUSOP DGGQA
UHETM ZMILE LHHPU PLHOV GPGQY EPEPY LULIF OZBOV ZZFOV EFBIE
VZVUO DZQZR GWZVN QFTIG YDETZ RFUIB ELGNE GJIPO BVXOC SVICJ
IHGBP EBOPV GOKQJ UUDYG HLGHW IUFOB TGFZL UUCAC HOYZD TWGCL
IKGYZ EYOWG DZBQZ NGEPQ UADIB RYMBA ZQQPI WZIKD YOHWE EITJZ
GHGMS ZDNIG DZUIV HZYUG GWGBX IUTAF OEUPZ EWVUX Z 2nd message AGSXM OGGAU
ZMGRD NGEZC ORGEF UCUOC NUPIX HKPIF NOOBH CAJEB GENOM WUCIS
PISIA KAYUX ZLEAU FUEMJ FEFHK UZHIB NODZW UYUJI VYEEW IVBGA
KWUSV PZHZV YIFEP RPUYG POKEO BGPIA KXORG MECTU GFEJI OYMRZ
UXGAE QGOCI RBJEH YUKTC ILOKS IRPOS ZQQYG CIMAG CTOZM ZMGRU
EANEV DREZV QZILW HCBOE WECIS ITMWF TDIOM EIXEG BWUQO DNOLK
IUDPZ XUSHZ EFELZ HGNYG XUDSH EKJZQ YUBIM SZVOT BBEZS ZEESZ
MAUIV OKHFM GNXYD ZAUJM YEEWZ JCUIT EIPWD NOPUB JHECM RENLX
DIVEQ ZORZL IQFEV GEJON GMVCZ CJGPZ XEQIF KOMTK EPERO JOPGU
WULDZ NUQCZ EBTUH PRTFQ UUKIU XUEDA UKEVT GSYOU GHEAS ZECMO
FHUEW ZRGVI REGQU RGHOB GEAIQ GMCEB UJPCE UVIKB ENUOO PFBIK
FKPEU TGSJE JZWEG XPEKM ZGCZC EMMPU JOMIQ GEUXL HOBZY DAGXC
FUXLI TJOXT UNGEG LVUWE NVJNS EKEXJ ZEFID KOBWG KLOHG DXEMZ 3rd message DUEBL FEXDR
UZMIX NOPZY LKBIK OQING QMEWZ FZRWM IGOYI ILIWV XGUOD UHOIS
UWUIP EMLAG DRQRU FQLIO IHAQP TUKOE AUXDI KOTFI ZSMIP UKTLZ
HICGF TGELV EXEXF VOQEV LUUJZ JHRGC GCIOK EXEMA LODEF RUUKZ
HZWOE YFETG BILMK ZPIGL NEBZT EVLIX GSSXG RWJJP ZEBOD GECHE
EZWTO MZEYH GXIFI OZTIC FSGAE JYGWG TZSFN ECTOX ZAXZK IOSIN
ZNUIC EYNCG ZZROF WCEPE BGGAU GMGBO DUJON POFVQ ZKPZF ZEIDM
ADJIY GHXZC XZHNH ZASZU YPKLZ AZCIT ERDNG PKEBU BUMOJ ZCOYA
PUTOY WQSZW UAGEF PCERA SPIAI WILIN EIUFP ELEFU HGNOM GCVIB
PRNEU DODRH EVVKU FZAFN KRGLL MSEDG VOQZH UTRHU PUTBO BECZZ
FZYKO ABOJF VIOZL ZYUFG WGDJE TUTED EWJZK GMQKS VGEWE WATIL
LQGMB UUBJE JOEPU MGUEW OERNH WUZVU CZRZN USFII SREHE IAAXC
FIPID XOTZF HIXEJ BGNIG SGGMN TZGAA ZIXIS DZKAI QOFHA ILOLJ
VCSXL YUXWX OXUEP VQUVN SERAU VUQSU YLCUJ YSMRU RUMJY IRTUZ
CIRCI KGWLP LOKCP TOYIO DGKIK EXEBD ECMZV WIFES EOMVE SROVZ
YAUIA GCEJG PZDYG XGELJ ZEIME ERIKI YEOHK GOWIE FKEZM IAOXE
WHUDU XPGZQ OFGED GMDBG MZRLP UWUPU FQOHR GPSUA ZAEPE RSQIU
DUMIM XOZDT SJIZI JJHLL IWEJR NSLES ZJAZV UHDAQ ZRHDB ICEPR
TURZB FGWZQ OTINC BOVZE WEWGD ERZBA GGHYG JPZBO AGQOA YUWI 4th message ABGOV EDPUC
EQZGV ZNQQZ GOTIK EONER ZEHLU BUMBZ YUAAD XEFZM GFETE IXLHZ
YJSZO WUFVI DOAHA FOTZU SEKTL WMGLZ OKOMP UVIRR UYEMU WKOBK
EDZQT DUCBE LHIWI JZUMO TENHO DMQEF NVIRG CIFMP ZVKEV ZWGKC
IUCOC WHEZI LOWFI ZVIBU JKJGU MUPVZ TUKIN EBZBG TZDYO PEAOV
FZAIP MOMZF GCTXX CMYQI YEMZB WHGWA PUNSQ KEKZQ GYEVE QLRIM
IJISI CEOTS GOEAB EJKEH ZEYZL VQGSZ FREHG MCFTJ EBEKE MVQKM
WGMIK EUKFJ SOJYW NOBZG VWUTB TGJPU TCGHG YXQAG VIXZS IAGSH
QSGYJ TUDNI LRGPU RZFHE YSGCN EMAEU ANCTJ GOETU RPOQC ZWEDZ
GKGPK LIPBD EFKYI EOLTE CELAE MZGNE APETQ GBIAI DTIYO BEYZJ
LGJEW SGOJI EHVOU UYVGH OGCTT EYQDU QGWEF BZYEG DOTAO IGYVO
AHYEF DUGQG JZMET GTZAA ZGQQZ UYWOU TQEZX UVDIT EJYWA IAQFL
ETMOR Z |