Cryptoanalysismethodforsolvingthekeyorsolvingthecorrespondingplaintextfromtheinterceptedciphertextbyselectingthespecificciphertextanditscorrespondingplaintextthatarebeneficialtotheattack.Oneofthewaysofcryptanalysis.Whenchoosingaciphertextattack,thecryptanalysthastheabilitytochooseorcontroltheciphertext,andhecanchooseanyciphertextanditscorrespondingplaintextthathethinksisbeneficialtotheattack.Thisisastrongerattackmethodthanknownplaintextattacks..Ifacryptographicsystemcanresistselectedciphertextattacks,itmustbeabletoresistciphertextonlyattacksandknownplaintextattacks.Selectedciphertextattacksaremoredifficulttoachieve.Onesituationisthatthecryptanalysttemporarilygainsaccesstothedecryptionmachine,butthedecryptionkeyissecurelyembeddedinthedeviceandcannotbeobtained.Atthistime,itispossibletodecryptalargenumberofselectedciphertextsandusethegeneratedInferthekeyinplaintext.Acryptographicsystemcanbeconsideredsafeonlyifitcanwithstandselectiveplaintextattacksandselectiveciphertextattacks.Theselectedciphertextattackismainlyusedtoanalyzethepublickeycryptosystem,suchastheselectedciphertextattackagainsttheRSApublickeycryptosystem.
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