Johdanto
Incryptanalysis,aknownplaintextattackisanattackmode,whichmeansthattheattackerhasmasteredacertainsectionofplaintextxandthecorrespondingciphertexty.
Inallcryptanalysis,itisassumedthattheattackerknowsthecryptosystembeingused.ThisassumptioniscalledtheKockhoffhypothesis.Theknownplaintextattackalsoassumesthattheattackercanobtainpartoftheplaintextandthecorrespondingciphertext,suchasinterceptingthefirstpartoftheinformation,andobtainingtheencryptionmethodthroughthistypeofattack,soastofacilitatethecrackingofthelatterpartoftheciphertext.
Hillciphersrelyononlyciphertextattacks,whicharedifficulttocrack,butareeasiertobreakthroughknownplaintextattacks.
Liittyvät termit
Vain salakirjoitushyökkäys
Ohita navigointi ja haku
Incryptographyorcryptanalysis,Vain salakirjoitushyökkäysisanattackmodethatreferstoanattackwhenonlytheencryptedtext(ie,ciphertext)isknown.Thisschemecanbeusedtoattacksymmetriccryptosystemsandasymmetriccryptosystemsatthesametime.
Theciphertext-onlyattackhopestoachieveseveralgoals,arrangedaccordingtothedegreeofsuccess:
Hanki jotain tietoaalkuperäisessä selkotekstissä.
Hanki alkuperäinenselkeä teksti.
Opi salauksenpurkuavain.
Theexhaustivemethodisaciphertext-onlyattack,buttheexhaustivemethodisgenerallyconsideredwhendesigningthealgorithm.
Valitse pelkkä tekstihyökkäys
Ohita navigointi ja hyppyhaku
Incryptographyorcryptanalysis,selectplaintextattackreferstoItisamodeofattack.Theattackerhasaccesstotheencryptionmachineandcanconstructciphertextcorrespondingtoanyplaintext.
Inthisattackmode,theattackercanarbitrarilyselectacertainamountofplaintextinadvance,encrypttheattackedencryptionalgorithm,andobtainthecorrespondingciphertext.Theattacker'sgoalistoobtainsomeinformationabouttheencryptionalgorithmthroughthisprocess,sothattheattackercanmoreeffectivelycracktheinformationencryptedbythesameencryptionalgorithm(andrelatedkeys)inthefuture.Intheworstcase,theattackercandirectlyobtainthekeyfordecryption.
Thisattackmodedoesnotseemrealisticatfirst,becauseitishardtoimaginethatanattackercanchooseanyinformationandasktheencryptionsystemtoencryptit.However,inpublickeycryptography,thisisaveryrealisticmodel.Thisisbecauseinthepublickeycryptographicscheme,theencryptionkeyispublic,soanattackercandirectlyuseittoencryptarbitraryinformation.
Valitse salaustekstihyökkäys
Ohita navigointi ja hyppyhaku
Incryptanalysis,Valitse salaustekstihyökkäysreferstoAnattackmethod.Theattackerhasaccesstothedecryptionmachineandcanconstructtheplaintextxcorrespondingtoanyciphertext.
Inthisattackmodel,thecryptanalystcollectsacertainamountofciphertextarbitrarilyinadvance,letstheseciphertextsbedecryptedthroughtheattackedencryptionalgorithm,andobtainsthedecryptedplaintextthroughanunknownkey.