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Munitions Building, 21st B Street, Washington, D.C. June 15, 1931 Hello Mr. Friedman, For once, it's not you proposing a challenge, but we proposing one to you. It's somewhat similar to the one concerning the Hebern machine, which you brilliantly won. It consists of 10 messages encryp- ted with the Kryha equipped with the standard 17-sector wheel. The messages are in English with- out separators. They concern the blockade of Venezuela in 1902. Following our work on the Kryha, Hurt created this challenge to test whether a skilled crypto- logist, using short, non-overlapping messages (like those broken by Parker Hitt), can withstand the efforts of ardent cryptanalysts like our- selves. Initially, Sinkov, Kullback, and I tried to break the messages without success. That is why we are proposing these to you, and why we ask you to explain how to solve it. I hope you will not be offended by our audacity in rever- sing the roles (teacher, students). Our goal is to advance the science of deciphering. Respectfully, Frank B. Rowlett --- Message 01 OODDX ZALQW WILOW
TNCJI SHPZF YFTLZ NQCAZ IMYLR MCXGA VZMOW KFLHX
RBZPT SLQWH XZZSE HDVZX HHQAS MFMOP YAQZA JHTZT
VNOXA MIQMJ KUGWE BHBLT ESKRO VONMV WQGXS TXIPW
HBKFM ZNJPK SGGTY IHGSO AEXSM OCBEB TELJA VWCAR
WWABN RWSWU WDXYK IACYU YBHDT CQDCN KSHIH QXCNM
OWNPF IOENZ UFFOQ YHLQR HKUGU TX --- Message 02 QQFFX WLOBR QEMOL
FQRXW LCBFD FEAOG FTTIW ZZWSS IXZEC IDIDY MVFPS
OAMVM QWVWI NNMJW ZZPFC NQKSA VOFQY MCFVH WAZBV
BVREP YNSEG RACMR FLQAZ XPXKM ULESF TZHTQ HXQZA
ETSTK HRRWS DSFSF RJSLW MOHYC QWFPL RBEAB BNOFO
ZQLAR JXWPX BCNTL KAGSW ZHPSG XAEQW LXOXU KXLWY
UAZSR HOZBM BRXAD ASIMJ EWTCN CLSDF NIPIS WRZNT
VGUZR KHETS FYZFZ EPBVC JELDR VE --- Message 03 TTQQX LQKVH JBTDJ
SRJKW QGKBG FPJCQ CWDOC LPIWV RTUDB HHUJN TLTTZ
LPTBK CULPI VSZHJ BLDGE PWWVE SFJCO NQLQR KSKHW
NSROJ XZFHO LVKJL TZFXB KSLWC GAVKI JNBHR NBDFB
LZNIJ JRKOD WBDJA NHUBJ JSIVK XNBLJ ICAOK NOTLK
XTMDV LXNIU FKQOU RAGVS CQJNX GFFAE PWYNG TPHXK
PGXUV LIELQ LPSQD SLSFC YMNTR JUCUP AOAJH GWRBC
FPSVN DMJQK LLATC WYFNQ TTWZR FQZIU ULQWU DRMZ --- Message 04 CCUUX DSNBF MJWSK
BFGZC FLQXP YUWMB IYHCV HITUE OZGPB IJGUN BRJIA
HGKCZ PRYUF JBYNW CKPUZ LFDCJ VMLJZ MSQQF JBOXO
XKDCA OJUTH DKVGX IQHRO XXBZD UNQPS UCJVF XSMML
DSHVY IWMDC HSYKU MSTYT YSMVF GHFZO HXOZL IZQOK
ANSMP ZLCXA VLBTA QXGNF NTASJ VVABK MFEZJ ZARZS
YURRO ESFQA VKILD IANKJ H --- Message 05 KKOOX JLWSV WVXUR
LCWEM LRZFI ECAWJ SBCUR PNUOA XZIMZ CLGFA CYZLP
MVQFJ PKACO OWSHQ YVWRI AZJYZ KPRQI AYCOT URPKL
WMOHJ JWTIS TPYEA HQKUA ZNFGP WHLUW BLCKL NAXJF
TCHDH WSBAV DDJPC SBFQH DWYDV MOJUM VHGEW BOEYF
VECQZ FXBPS QVNNK QDXHT YCRMD UKHCL RWPYE KLWXH
HXASK MGPJY TBKML GGJVM CUZFI QONRA QWLYH XUGNH
GAURY VTAWR TYBTL PESFQ YPNOR YZKEC DBIXK MDRUZ --- Message 06 NNYYX JUVRW HCIIU
VYLBR LGPQD MACJA NVORF ZACTC NLHOX UBCXY PZQNU
BQADR YXWEV FDVXO XXCNL QDWSA ZYLJA GVCYS FYZHD
ZUNUK DHOLX YDWID VZOZL KBKNG RLGBD ITCQY DYCLO
LXWKA TGOKU ZBSOH UWCLO QJUOX JMYGG IVKWS FJZMZ
NOZXZ EWLEY IOZRN KZGEZ GTHXP KFSMW NGTBU VPZDG YVVBG
GVKUR EDJAU NWELL OCFGY M --- Message 07 SSIIX CMJYA ZKGKJ
QTMRE SWVBT WJJZV MPVBS PZHYP GYRPI FJJMV CJDIK
TALRL TLKBF JUVOA OAPSH XZBXZ IHDPG QWQAC HQLSD
FOJEJ VFASO UCIEH NDGQE IPKBO EVIAV XKSEL PDIWC
GMTZP TPACP ZUTWC LQEDK FDSXF SZFPR YLOFA XDXSI
VNOKA BFAQI JJDFF KBVLJ KRBUF AVSMN UYPPA CRXBA
MZSZR BXRDA DSMHC MWIVO KMOLQ VYD --- Message 08 IIBBX HTYJK MURUR
XVDVU VLIEH CUSQF BCDWL KGTLF XIKDY XDVLC HSREH
ODOYC AYVNQ VSGHT LRALY TADDB MZMHY VAKCA CZPFD
CAEXI JGZEU TFDSL OEBIU DJIKV JIMOO JPZPT WKDAN
PAJPY TJTAV DNDWY CLUWB XRHCZ GRQZJ MZAUD WAQKF
GENZX DEUTE LQDEL TITXK MPWJE LTKAD SCLQM XJPHB
TKFHV GMDWC YYGBF FBQIJ PWVYW WCOXG YHROX XJTZZ
WTDIE KXCTL V --- Message 09 FFGGX GVQIN KDELK
GPLIE AQZJI HOTGD BVYMV AZLUX KFYYE SZITQ UXFHM
OAUHI TJMKR VYLTD KSMQS VNGXH ODCIR QCJOA UBQXO
DNDVO FKQQR XJZFD CPHEF EULHT AMWBL ECVHS IJRXY
ONNFF FNOJR WJPFG LXCPW XMIEP EMFTP CTVGK GYLXA
OLUXZ NKGPZ UMBMT JVHBY QSEMT IXMXH HGGXE UCIDM
TCHJT IZORJ IQDSK BOOVF RAVUT OVMWM PAGRW BQLAO
PUCBC NSBIJ YRASS IGJ --- Message 10 UUPPX BSFLQ HGDEY
LLSRZ BSXTL BCOFT AOUZX UDAAG LZXOK LTYHT FQXCV
RLKTO UZRJV ZUGLD AMTWL FMOJR LDKFH TPVUF AAJBO
QPRTU BSXTZ DEELT HTCND ONHKR UOQEQ WETLC BLVAB
NLRJY MHXCA CEOKV TJEZJ KGZKZ PEXNV HDFNG QYLWV
JEIXU SGQPK WHFVF JWPWK IUFPK WYHRA UAYGK QBDZH
CVXBV FXCGT XJRCK DJZWW FADFB |