Symmetric,orprivate-key,encryptionisbasedonasecretkeythatissharedbybothcommuncatingparties.The()partyusesthesecretkeyaspartofthemathematicaloperationtoencrypt()texttociphertext.Thereceivingpartyusesthesamesecretkeytodecrypttheciphertexttoplaintext.Asymmetric,orpublic-key,encryptionusestwodifferentkeysforeachuser:oneisa()keyknownonlytothisoneuser;theotherisacorrespondingpublickey,whichisaccessibletoanyone.Theprivateandpublickeysaremathematicallyrelatedbytheencryptionalgorithm.Onekeyiausedforencyptionandtheotherfordecryption,dependingonthenatureofthecommunicationservicebeingimplemented.Inaddition,publickeyencryptiontechnoligiesallowdigital(_______)tobeplacedonmessages.Adigitalsignatureusesthesender'sprivatekeytoencryptsomeportionofthemessage.Whenthemessageisreceived,thereceiverusesthesender's()keytpdecipherthedigitalsignaturetoverifythesender'sidentity.横线处应选()
A.interpretation B.signatures C.encryption D.decryption正确答案B
