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Munitions Buildings, Washington D.C.
Signal Intelligence Service
February 17th, 1931
My dear students,
Here a new problem. The topic is the 1812 war. The
rotor order is unknown but we know the
beginning of the message (“MESSAGENUMBER”) .
The machine is set in the cipher mode. Your
mission is to find the whole key (Rotors order and
their initial position) and to decipher the
message.
W. F. Friedman
KMPEP WGMQO NZEZH
YDYWC LQIAM IUVKJ JRAKV DLJHU RMZZE ANEZA
NECDR WSTVD DAZEC XYVPE NKJPV ZXRWN KDALT JLLUX BHBAA SFAYQ
HKKUI ANBGA EGMRE NKBCO MRPGA XVJPG CZDND UQQVX PEFAQ EXVFG
JZGNK IEYEO VWUQJ VUOQV WGNJZ UPSYU LQNIU GLGJY PTTCQ YKSFS
GPGMU WVMGB NYASO DQNLF EFMHI KRTIB LFYSH OWQAZ VESUA FSFCD
LXYKG PQYJR EZVNP WCMNM RUSKI HMWEU QFRCZ WZDGM IYTVO XYKGI
ROEQU RBLEF TRIME GBRIO RJLGZ DILMA OSDMK VPEJP UMFBU TAKYH
UHHSU PBKBL IGWJO DHXTK JHZSG DWTEC IAQAB
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