Hebern: 5th Problem

Munitions Buildings, Washington D.C.

Signal Intelligence Service

February 20th, 1931

My dear students,

Here a new problem. Nothing about the key or the
message is known except the topic: the 1812 war.
You must discover the key and to decipher the
message.

W. F. Friedman

ZPGLF XWVTW YPAZV ALXWB NCSBR HGQQV JKAIF WHMCX ZFSXL STOGM

CCQPE TQWWH TJQDY QYHYL XRLBS UXQEK GQBQY QIEYP ZVMCM JYQBG

SXNWO HOCIK KWSDL JAXUT VCYBF IRQJL PNRYA NJPAM ACZWP FMUAD

UPKLV SZZPN JKFUG ULBCL CPIDH DQAJO OZUHU XIJAZ DCQTK QRGUP

DDZOB HFHWX BYPLR RGDUD KRBNK ZGCMS YKOTL UYQCC IFXFZ UTZEV

HUYKZ ZEIHY AGKNP OBGEK KZEOP ODHLS PYAPJ JTMUD GBBSK MHHXZ

TYBVD QQTXK DWEWE HJDOT OOYAP BYCHO GWNIX SQHPR AQNEQ ODTTT

MTXFM YHDOC GDJSM FKSBO RWCKP ZOSIT CSJXY TTUBB SVAXU HSQRE

OWJFH NPQKK IBSXS CTTJJ QQXXX