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    PKI基礎知識

    2016-3-1 11:05:25

        PKI ( Public Key Infrastructure )指的是公鑰基礎設施。 CA ( Certificate Authority )指的是認證中心。 PKI 從技術上解決了網絡通信安全的種種障礙。 CA 從運營、管理、規范、法律、人員等多個角度來解決了網絡信任問題。由此,人們統稱為“ PKI/CA ”。從總體構架來看, PKI/CA 主要由最終用戶、認證中心和注冊機構來組成。
    PKI/CA 的工作原理是什么?
        PKI/CA 的工作原理就是通過發放和維護數字證書來建立一套信任網絡,在同一信任網絡中的用戶通過申請到的數字證書來完成身份認證和安全處理。
    什么是數字證書?
        數字證書就像日常生活中的身份證、駕駛證,在您需要表明身份的時候,必須出示證件來明確身份。您在參與電子商務的時候就依靠這種方式來表明您的真實身份。
    什么是認證中心( CA )?
        一個認證中心是以它為信任源,由她維護一定范圍的信任體系,在該信任體系中的所有用戶、服務器,都被發放一張數字證書來證明其身份已經被鑒定過,并為其發放一張數字證書,每次在進行交易的時候,通過互相檢查對方的數字證書即可判別是否是本信任域中的可信體。
    什么是注冊機構(RA)?
        注冊中心負責審核證書申請者的真實身份,在審核通過后,負責將用戶信息通過網絡上傳到認證中心,由認證中心負責最后的制證處理。證書的吊銷、更新也需要由注冊機構來提交給認證中心做處理。總的來說,認證中心是面向各注冊中心的,而注冊中心是面向最終用戶的,注冊機構是用戶與認證中心的中間渠道。
    PKI/CA 的作用是什么?
        以數字證書為核心的 PKI/CA 技術可以對網絡上傳輸的信息進行加密和解密、數字簽名和簽名驗證,從而保證:信息除發送方和接收方外不被其它人竊取;信息在傳輸過程中不被篡改;接收方能夠通過數字證書來確認發送方的身份;發送方對于自己的信息不能抵賴。 PKI/CA 解決方案已經普遍地應用于全球范圍的電子商務應用中,為電子商務保駕護航,為電子商務的健康開展掃清了障礙。

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