CErtiFiCAtEs ArE{{u}} (5) {{/u}}DoCumEnts AttEsting to thE{{u}} (6) {{/u}}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{{u}} (7) {{/u}}somEonE ElsE. in thEir simplEst Form,CErtiFiCAtEs ContAin A puBliC kEy AnD A nAmE.As Commonly usED, A CErtiFiCAtE Also ContAins An{{u}} (8) {{/u}}DAtE, thE nAmE oF thEC
A、thAt issuED thE CErtiFiCAtE, A sEriAl numBEr, AnD pErhAps othEr inFormAtion. most importAntly, it ContAins thE DigitAl{{u}} (9) {{/u}}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.
A、tExt B、DAtAC、DigitAlD、struCturED