The Works of Edgar Allan Poe

第18章

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第18章

The Works of Edgar Allan Poe Edgar Allan Poe

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The Works of Edgar Allan Poe
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  “Now,inEnglish,theletterwhichmostfrequentlyoccursise。

  Afterwards,successionrunsthus:_aoidhnrstuycfglmwbkpqxz_。_E_predominatessoremarkablythatanindividualsentenceofanylengthisrarelyseen,inwhichitisnottheprevailingcharacter。

  “Here,then,weleave,intheverybeginning,thegroundworkforsomethingmorethanamereguess。Thegeneralusewhichmaybemadeofthetableisobvious-but,inthisparticularcipher,weshallonlyverypartiallyrequireitsaid。Asourpredominantcharacteris8,wewillcommencebyassumingitasthe_e_ofthenaturalalphabet。Toverifythesupposition,letusobserveifthe8beseenoftenincouples-for_e_isdoubledwithgreatfrequencyinEnglish-insuchwords,forexample,as’meet,’’。fleet,’’speed,’’seen,’

  been,’’agree,’&c。Inthepresentinstanceweseeitdoublednolessthanfivetimes,althoughthecryptographisbrief。

  “Letusassume8,then,as_e_。Now,ofall_words_inthelanguage,’the’ismostusual;letussee,therefore,whethertherearenotrepetitionsofanythreecharacters,inthesameorderofcollocation,thelastofthembeing8。Ifwediscoverrepetitionsofsuchletters,soarranged,theywillmostprobablyrepresenttheword’the。’Uponinspection,wefindnolessthansevensucharrangements,thecharactersbeing;48。Wemay,therefore,assumethat;represents_t_,4represents_h_,and8represents_e_-thelastbeingnowwellconfirmed。Thusagreatstephasbeentaken。

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