张三从安全认证中心(CA机构)得到了李四的数字证书(X.509格式)，张三可以从该数字证书中得到李四的(9)。

(74)

(75)

(73)

(72)

(70)

Although　the　bulk　of　industry　resources　and　energies　have　focused　on　developing　the　fastest(71)or　slickest(72),　more　and　more　mindshare　is　turning　to　the　evolution　of　the　computer　interface.　Advancements　in　the　areas　of　input　devices,(73)processing　and　vitual　reality　could　lead　to　fundamental　changes　in　the　way　human　and　computer　interact.　The　technological　battlefield　of　the　future　will　be　adding　layers　between　the　user　and　the　raw　machine　to　make　the(74)as　invisible　as　possible.(75)crepresents　the　next　evolutionary　step　for　the　interface.

(69)

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(65)