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SIGNAL SERVICE, WAR
DEPARTMENT, WASHINGTON D.C.
January 1935, the
27th,
Mr Rowlett,
We intercepted a
message from the Swedish embassy in Moscow.
The message was addressed to the Ministry of Foreign Affairs
in Stockholm. The Swedes use the B-21 machine. They use the
commercial machine manufactured by B. Hagelin but they use a
special keyboard square. You should not have difficulty to
decipher the message.
Especially since a
spy sold us the key list used this month.
Good luck !
W.F. FRIEDMAN
CHIEF CRYPTANALIST
The 5x5 Square:
QERTY
UIOPA
SDFGH
JKZXC
VBNML
The cryptogram:
PPXVJ JMDOH VNJKM HDXOD YCTHP MOJNU SVERB GIGLZ ZRTSA
VZFXY
LQPQY CZYKK DYDZP PLNZY DEIAE FGRDP SVCAG UGNLE RIVVT BUDZD
CTGUX HSZYD XFZPK XQPCY AZECN NPJEU IVHOE EIFAZ NPNYU UYOQP
SCEMF SBDLJ ZDUMG HNHQD ELXBP ECFLQ NBJLJ NNSLT CFCAS KCUHS
PSMGH USKAC NYJQX MJZXZ QXUYS NKBXH TXEEA CZBZB EAYDO JQMGS
FEJIM OFGTQ MHBBX JVCFH QSQYD DLFZM CPFEV MEXVG XMBEE LAAER
SKXUX FTVIB GIMIG OPFYP LEOIX DCGTD AQLFM QMOPO ZTIAE UXLZM
ZYZIT APRBI JQJZO CNZTJ EBZCV LQZEB QSVZN ZQPYC EALTA XEDSN
ONMJS STAKC OAIAR JTNMT HYXBF DOSUF VFGSL ZNZLM RELUB FJKDM
NYQJD LDPLP FNHQN FJRIK THMHG OTVLH REZYP OZZXE PYJOJ CGBFI
XROPL ZHIHR GKGSV FGTZC FYTDV MESLI HACXY SIVDU YEFUR EUVSU
XKGIA FGRRV JVSOB FEPZH GPSQM PHNJF LEODS ABDME QDBYI HCERL
JUQFE NMGJJ CLFXT IBESO FJUOG TZVQH UGTIK YPEMG UDHAO NNEPD
DLRET QSUPM FVUDQ CXNEQ ZGSMR HJUYU AKZGE XVSVD YHLZZ FIBXP
PPXVJ JMDOH
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