signature PKI
系统的设计确保系统在遭到外部或内部攻击的情况下仍能使认证机构的签名私钥不被攻击者获得，并且实现公钥基础设施组件间的互操作性。
The design ensures that the private keys will not be obtained by the attackers when the CA is attacked and the design will realize the interactivity of the components.
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