Cryptology Empirical Values for Natural Languages

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Example 6: Two Polyalphabetic Ciphertexts With the Same Key

Now we encrypt the poems by Heine and by Busch with the same polyalphabetic substitution and compare the resulting ciphertexts:

UNISN PMOLQ AQXVL VSUDU MUBTJ NIVXC OTIOZ QPDWV XIBQX URRTL
MMIWH HZRCW UNMPD WHJUY MPNLO NZCNP MDSSY ANPEA SLWUM VHFBS
  |                     |     |                            
MALOO WCRWU RFPPA NDBMG OKJJM AEDZB TLABN OQKSN DJEYK TIMDA
FNEDD WHRUS EDYFC RVQRC OLLGY AMUHR TSOVM MJWJS YNIQO CXWFN
      | |               |     |     |                      
MPEPA NZATX RWKRY URBRL LEYKZ RSRNN ATVCY RHWYY VDYYH AMBID
EDMBS UKUHN OTOFI DXVST XFDLX COBKN JOQIL YJWZN ZBRKD RJQXF
                                  |         |              
DRKSJ CRMWR HWUOQ DYQTN AQOXO VNNXV MILVJ FYRRO JFIND UMGNS
ZWXEY ANPMV STYAL IOOTS LQTNK RINDG YUNRX QJCRB VDLLX RMVNF
                     |   |      |            |         | | 
HNMAL MSPAC IDMVE RCEMA LYOBA NZBZD YQNMW XEHST STXQZ VNBDJ
CELVM FJRKQ UMMPU RJKLV ZWOCO FIXVI LVHNW UEFID SIXLZ VDWXE
              |   |       |             |  |    | | | |    
YBKUI PASXT JHSPA HYAXI RTDTY APMOW IRYAL NSBKS JQRPS TCQYB
YNMIY LOFJC XQNHX LXVPQ DRAEZ QCQZD XVFAL EHFBA BPRDD RHEYA
|                                      ||         |      | 
EQMFC EDLJH NZUND YNVNW BTMBM PNFXZ NQXVN BDJXD IIEDW NIYRD
XXYHT NXQTM OOXLX VPCSR EMCKM PYFCN IBEIY ZYBDQ XVNBX FLDXC
                            | | |                          
JCJND MRMMQ TNNLX PIFVD JTOUO FCEBV JHYWV HYAVE OPANB CHXLV
PKTNA QXEBS SIBQL EOPAN IANPJ BTLAQ XKSBI FYVXD DWKHY VEPSP
   |                                       |               
IMKNY OXFCE CVVC
ASPVM COBTL ZUTD

—an expected result because identical plaintext letters are transformed to identical ciphertext letters.