Similar bridge CA trust model partitions the current PKI system by geography position forming several subareas; every subarea has many trust areas.
类桥CA结构信任模型将已有的PKI体系按地理位置划分为不同的分区，每个分区中包含多个信任域。
Similar bridge CA structure model satisfies the requirement of PKI system's extending.
类桥CA结构模型满足了PK I体系大范围扩展的需求。
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