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SIGNAL SERVICE, WAR
DEPARTMENT, WASHINGTON D.C.
September 1936, the 7th,
Mr
Rowlett,
We intercepted an
another message from the Swedish embassy
in Moscow. The message was addressed to the Ministry of
Foreign Affairs in Stockholm.
Our spy sold us a
part of the key list used this month.He also
told us how to work the indicator. For example, if the
indicator is : PPABC DEFPP, the message
key is BADCFE
Because the message
comes from Moscow, we suspect the
presence of these probable words:
Zinovjev, Kamenev, Stalin, trotskistisk
In addittion, each space is coded by an “X”.
This message isn't
easy to solve, but I know you are stubborn.
W.F. FRIEDMAN
CHIEF CRYPTANALIST
The cryptogramm
PPFCI YMDPP VERJV DUHAG GGTDK QNSNN RGJYD NKHVM
OLMOV BIZTC OBUVR FFVTS XOQEX JVNIJ KKCLH ASLPD
NMZPM HZUYR HMURV MIHNO USVRQ ALPGZ PCYYT PQZIB
QZFTD TYLPC LPZHR HQPUT ZVYKA TVLAO IITXK GLGVZ
CGXBK ZXCYD AZCBC NDZOG YZLHK PDAJD RTJCB MCRVH
BJISK LCYGL MPXUM NZHUZ YDGQY NYDRL EREYU TDNVB
FBYFP EOFYE PVEVA IEAJX ETEXA OBUYL ODQSG XCXEA
FQQAN CKZOS LDNIN ZQESX OKEXV XLCMY YHTRP JBKQI
NLKGB KZDKV DSARY SUNHA MJFRN BUMBY RPFAY OSHIH
IRGHG UIOPZ LHOYA NHUDZ EZOXC YZIJO VVAYZ RVYBF
OZBBX KKFUA PEZRA BOMYY HYBEN MNTOY BCRSC UFQCG
QGTDG EHSCO SRNZJ EEGTS COYUU COKBG IRNZN CDZBY
DEBFQ UOCVG MRTAU XSKPT BTRHQ KOXUS JRUFZ RPSMU
UKHIZ OZRGS CMGJS LTVUZ EJKKU KLDHL NIAJX GUMIF
VLGDH VLLXB UMYKL GAMTX ZHPEG OSSSM KNQLG HZQSF
THHCB ISMMX FEYZY NAMXB ATGSO EZFRZ CIGBC MBXXV
CMOLE IXIKK HSRFO LUDBI ABNQU JUPFD TESIU IUQVT
RRGNA GSQSN JEVPE TBYCU CFYXK NZKFD PKLEJ IASNE
LFVLD QQONR BBJKQ TRBGB TEJNM NPXXZ DTTUQ DFLIH
RGQTD EMVIM FKTYG UEURC OZJIO PIJPL JBCVM YXTFS
GALLE XNYMY TBFEU PTHVC OLRMD CIFRP TXAQF PPFCI
YMDPP
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