Allthreetypesofcryptographyschemeshaveuniquefunctionmappingtospecific．Forexample,thesymmetrickeyapproach()istypicallyusedfortheencryptionofdataproviding(),whereasasymmetrickeycryptographyismaidyusedinkey()andnonrepudiation,therebyprovidingconfidentialityandauthentication．Thehash()(noncryptic),ontheotherhand,doesnotprovideconfidentialitybutprovidesmessageintegrity,andcryptographichashalgorithmsprovidemessage(本题)andidentityofpeersduringtransportoverinsecurechannels．
A.Confidentiality B.integrity C.service D.robustness正确答案C
