因此，每一个类或者对象“属于”一个ProtectionDomain，安全策略对这个保护域授予了某种访问权限。
Therefore, each class or object "belongs to" a ProtectionDomain, to which certain access permissions have been granted by the security policy.
基于等级保护的思路，按照不同数据的不同安全等级，给出了川航信息网络的信息域划分方法。
Based on the theory of graded protection, information domain of SCAL information network are divided as well according to the different safety grade of different data.
保护私钥不泄露是整个CA域的安全基础，CA的私有密钥一旦泄露，该CA签发的所有证书就只能全部作废。
It is the foundation of entire ca field safety that protection private key do not reveal. When the private key of a ca is compromised, all the certificates by that ca should be revoked.
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