2. 计算机
  3. Certificates　are(16)documents　attesting　to　the(17)of　a　public　key　to　an　individual　or　other　entity.　They　allow　verification　of　t

Certificates　are(16)documents　attesting　to　the(17)of　a　public　key　to　an　individual　or　other　entity.　They　allow　verification　of　t

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问题 Certificates　are(16)documents　attesting　to　the(17)of　a　public　key　to　an　individual　or　other　entity.　They　allow　verification　of　the　claim　that　a　given　public　key　does　in　fact　belong　to　a　given　individual.　Certificates　help　prevent　someone　from　using　a　phony　key　to(18)someone　else.　In　their　simplest　form,　Certificates　contain　a　public　key　and　a　name.　As　commonly　used,　a　certificate　also　contains　an(19)date,　the　name　of　the　CA　that　issued　the　certificate,　a　serial　number,　and　perhaps　other　information.　Most　importantly,　it　contains　the　digital(20)of　the　certificate　issuer.　The　most　widely　accepted　format　for　certificates　is　X.509,　thus,　Certificates　can　be　read　or　written　by　any　application　complying　with　X.509.
选项 A、communication
B、computation
C、expectation
D、expiration
答案D
解析
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