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Munitions Buildings, Washington D.C. April 30, 1941 Dear Bob and Albert, Your goal is simple: decipher the following messages. Unfortunately the Japanese no longer respect the separation of vowels and consonants. I remind you that the text is in English and the words are separated by the letter Z. I give you several Cribs: Z stop Z Z comma Z Z General Z
Claire Z Lee Z Chennault Z Z United Z States
Z Army Z Air Z Corps Z Z American Z
Volunteer Z Group Z Z president Z
Franklin Z Roosvelt Z Z the Z flying Z
tigers Z We also know that messages begin by the word MESSAGE followed par a number composed by three digits, for example Z ONE Z TWO Z THREE Z. the word STOP ends the header. The five messages were intercepted on different days, then the plugboard is different for each message, but they have the same indicator: 36153 (which we removed). We can therefore deduce that the five messages were encrypted with the same key (start positions of wheels, cipher mode, direct or verse mode and pins setting). We know a part of this key: - Decipher mode - Direct mode - Pins setting:
11111111111 In the end, we were able to find the SIXES for each day and therefore for each message Good Luck ! Frank Rowlett 1) The First Message – SIXES: IGTVSZ BAIVR ZOTFT GFTTQ FPIVN YKZST EBGCX ETINS RGTRK VAVSJ WWIKZ SZUYT TGELI XJHMS JCWIG MHSJS QWCUS WRZEV VKPKR VWJGV YXNXZ WAOTR ISLTL EVZVQ TCTGP TTJSR GNZGG BSVIM GYEZB XGTVJ XSTIS QHYJZ GGTFA UVHTR COXZC AYZTQ KLKIN WDSSF EFJSN BWTJS AMALB SBVZV XCXFH VZGHW I 2) The Second Message – SIXES: BHKMPW HNIJG URRNC TYYQA TATXB LJIFZ MXPUU ZOHQH DABCR WQOZY KRRIG VFGAQ EBTRT IVFXH CCPUS OTNYN GGEBI IARIQ CORGC VYVFV JXGXI ILONB EAADC DFMEU GGRPL LANHQ OEAXU SQFPV ZWCCU QOOSL ESAIT FUYEG BQTOD NJENX HSRWJ YYEQS QDUJL WQSST EUXKW NFIHA AUUEG IHVEE CXTXN OMSAA DGUFV IUBSS WCUTN FFAYG MVTPF NNAZV ZHODH NQQXV QSGWL 3) The Third Message – SIXES: AEGHMY MEOIA EGQTO UCCQO PYOZL XMLIW TVQKM GNOUM IWMIR ZEGXF RASGP ZMBTR GVAYT GLMVX LFHNW YNREH JTMGT KYIVW RBTVF WOGMM JJEFM DIZEM NYVSI TCYWD SEOPY DNZMF SJELJ WVTHS LPDCF BPWIS EFTSX VFLTR ANDQM JBFNA GAQNJ WUYAM WVZHA DHAMR SZHLX WGTEK VCNCL KALPY EAQZJ IBC 4) The Fouth Message – SIXES: EFRTUY XRPBH BFGUQ BOYCY YEPVR HYQZQ ELKNT HRCUB ENLOQ RVWRY ADCRR MCPIF WFWBG TXUSU UFGZO TJZTS COPDY ADHOE EDFGX RERVC QXLTL AJYOS KRDFF MJUUL XFEUU PEDTI COSTA MZHVX RUBZQ WFMXI MMFGP EIOVA ZPBZJ OUVZO TDTGR MJVUR GSSWL AGMIK MDEGX KOKTS RLPML AHFRJ OBCCV UOMBU TJKEQ RAFZY YIYWV SPCXT WSJMJ KXPFC ZD 5) The Fifth Message – SIXES: JNOQTY ARWAB SDBLY HVHGG HQIQV IRLFK NTHVC DOXQZ ZQFMX IVCSL ESSYK UUIHS ZAFTV RMERT KGBGW CPMCP VQMZM RRMNE LSLKS MPSIP CQJFM TAVAE ALAJV AIMGG QXFFE MGCIA YZBZZ XKVAT WNFJR RKCYX JSDKE UBKAP NJUOG QLPJO DGSMV YKCFP COYFM SNCLB OSDKS BQHTR QZIXX IYCAF UDQVG KKTSP KOBPS RVQJW D |