Код да Винчи

Chapter 47

           Inanerawithouttelephonesore-mail,anyonewantingtoconveyprivateinformationtosomeonefarawayhadnooptionbuttowriteitdownandthentrustamessengertocarrytheletter.Unfortunately,ifamessengersuspectedthelettermightcontainvaluableinformation,hecouldmakefarmoremoneysellingtheinformationtoadversariesthanhecoulddeliveringtheletterproperly.

           Manygreatmindsinhistoryhadinventedcryptologicsolutionstothechallengeofdataprotection:JuliusCaesardevisedacode-writingschemecalledtheCaesarBox;Mary,QueenofScotscreatedatranspositioncipherandsentsecretcommuniquésfromprison;andthebrilliantArabscientistAbuYusufIsmailal-Kindiprotectedhissecretswithaningeniouslyconceivedpolyalphabeticsubstitutioncipher.

           DaVinci,however,eschewedmathematicsandcryptologyforamechanicalsolution.Thecryptex.Aportablecontainerthatcouldsafeguardletters,maps,diagrams,anythingatall.Onceinformationwassealedinsidethecryptex,onlytheindividualwiththeproperpasswordcouldaccessit.

           «Werequireapassword,»Sophiesaid,pointingoutthelettereddials.«Acryptexworksmuchlikeabicycle’scombinationlock.Ifyoualignthedialsintheproperposition,thelockslidesopen.Thiscryptexhasfivelettereddials.Whenyourotatethemtotheirpropersequence,thetumblersinsidealign,andtheentirecylinderslidesapart.»«Andinside?»«Oncethecylinderslidesapart,youhaveaccesstoahollowcentralcompartment,whichcanholdascrollofpaperonwhichistheinformationyouwanttokeepprivate.

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