16．規(guī)定數(shù)字證書內(nèi)容與格式的標(biāo)準(zhǔn)是(      )

A.PKCS#5                                                        B.PKCS#6

C.PKCS#8                                                        D.PKCS#10

17．牽頭建設(shè)CFCA金融認(rèn)證中心的銀行是(      )

A.中國工商銀行                                               B.中國人民銀行

C.中國銀行                                                      D.招商銀行

18．哪種情況下，用戶需要向CA發(fā)出證書撤消請求？(      )

A.私鑰丟失                                                      B.公鑰丟失

C.證書丟失                                                      D.證書超過有效期

19．SSL協(xié)議工作在TCP/IP體系結(jié)構(gòu)的(      )

A.應(yīng)用層                                                         B.傳輸層

C.網(wǎng)絡(luò)層與傳輸層之間                                    D.應(yīng)用層與傳輸層之間

20．工商銀行網(wǎng)上銀行在客戶、商戶、銀行三方間采用的SSL加密密鑰長度是(      )

A.64位                                                            B.128位

C.256位                                                          D.1024位