Allthreetypesofcryptographyschemeshaveuniquefunctionmappingtospecific．Forexample,thesymmetrickeyapproach(71)istypicallyusedfortheencryptionofdataproviding(72),whereasasymmetrickeycryptographyismaidyusedinkey(73)andnonrepudiation,therebyprovidingconfidentialityandauthentication．Thehash(74)(noncryptic),ontheotherhand,doesnotprovideconfidentialitybutprovidesmessageintegrity,andcryptographichashalgorithmsprovidemessage(75)andidentityofpeersduringtransportoverinsecurechannels．
A.Conduction
B.confidence
C.confidentiality
D.connection
正确答案是C