16.CA系統(tǒng)由多個(gè)服務(wù)器構(gòu)成，其中負(fù)責(zé)證書(shū)簽發(fā)的服務(wù)器是

A．安全服務(wù)器                                             B．CA服務(wù)器

C．注冊(cè)機(jī)構(gòu)RA                                            D．?dāng)?shù)據(jù)庫(kù)服務(wù)器

17．保護(hù)Internet上付款交易的開(kāi)放規(guī)范是

A．SSL                                                         B．SET

C．RSA                                                        D．EDI

18.SSL握手協(xié)議的第一個(gè)步驟是

A．服務(wù)器Hello                                             B．客戶(hù)機(jī)Hello

C．加密解密數(shù)據(jù)                                          D．HTIP數(shù)據(jù)流

19.CFCA認(rèn)證系統(tǒng)采用國(guó)際領(lǐng)先的PKI技術(shù)，總體分為多層CA結(jié)構(gòu)，其中第一層稱(chēng)為

A．根CA                                                      B．政策CA

C．法律CA                                                   D．運(yùn)營(yíng)CA

20.SHECA提供的數(shù)字證書(shū)按業(yè)務(wù)類(lèi)型分為多種，符合X.509標(biāo)準(zhǔn)的是

A.SET證書(shū)                                                   B．Email證書(shū)

C．Universal證書(shū)                                          D．X509證書(shū)