Úvod
Incryptanalysis,aknownplaintextattackisanattackmode,whichmeansthattheattackerhasmasteredacertainsectionofplaintextxandthecorrespondingciphertexty.
Inallcryptanalysis,itisassumedthattheattackerknowsthecryptosystembeingused.ThisassumptioniscalledtheKockhoffhypothesis.Theknownplaintextattackalsoassumesthattheattackercanobtainpartoftheplaintextandthecorrespondingciphertext,suchasinterceptingthefirstpartoftheinformation,andobtainingtheencryptionmethodthroughthistypeofattack,soastofacilitatethecrackingofthelatterpartoftheciphertext.
Hillciphersrelyononlyciphertextattacks,whicharedifficulttocrack,butareeasiertobreakthroughknownplaintextattacks.
Související pojmy
Útok pouze pomocí šifrovaného textu
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Incryptographyorcryptanalysis,Útok pouze pomocí šifrovaného textuisanattackmodethatreferstoanattackwhenonlytheencryptedtext(ie,ciphertext)isknown.Thisschemecanbeusedtoattacksymmetriccryptosystemsandasymmetriccryptosystemsatthesametime.
Theciphertext-onlyattackhopestoachieveseveralgoals,arrangedaccordingtothedegreeofsuccess:
Získejte informace v původním prostém textu.
Gettheoriginalplaintext.
Naučte se šifrování klíčů.
Theexhaustivemethodisaciphertext-onlyattack,buttheexhaustivemethodisgenerallyconsideredwhendesigningthealgorithm.
Vyberte prostý textový útok
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Incryptographyorcryptanalysis,selectplaintextattackreferstoItisamodeofattack.Theattackerhasaccesstotheencryptionmachineandcanconstructciphertextcorrespondingtoanyplaintext.
Inthisattackmode,theattackercanarbitrarilyselectacertainamountofplaintextinadvance,encrypttheattackedencryptionalgorithm,andobtainthecorrespondingciphertext.Theattacker'sgoalistoobtainsomeinformationabouttheencryptionalgorithmthroughthisprocess,sothattheattackercanmoreeffectivelycracktheinformationencryptedbythesameencryptionalgorithm(andrelatedkeys)inthefuture.Intheworstcase,theattackercandirectlyobtainthekeyfordecryption.
Thisattackmodedoesnotseemrealisticatfirst,becauseitishardtoimaginethatanattackercanchooseanyinformationandasktheencryptionsystemtoencryptit.However,inpublickeycryptography,thisisaveryrealisticmodel.Thisisbecauseinthepublickeycryptographicscheme,theencryptionkeyispublic,soanattackercandirectlyuseittoencryptarbitraryinformation.
Vyberte šifrový textový útok
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Incryptanalysis,Vyberte šifrový textový útokreferstoAnattackmethod.Theattackerhasaccesstothedecryptionmachineandcanconstructtheplaintextxcorrespondingtoanyciphertext.
Inthisattackmodel,thecryptanalystcollectsacertainamountofciphertextarbitrarilyinadvance,letstheseciphertextsbedecryptedthroughtheattackedencryptionalgorithm,andobtainsthedecryptedplaintextthroughanunknownkey.