This configuration is more maintainable and more scalable since there is only a logical segregation and therefore each individual data element may be encrypted by a separate key.

这种配置更容易维护，也更容易扩展，因为其中只有一个逻辑分离，因此每一个数据元素都可以使用不同的密钥进行加密。

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Data transformer: This is a key element of an ESB.

数据转换器：数据转换器是ESB的关键元素。

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A key element in the data model is the set of statistics gathered about the data contained in the database and stored in the system catalog tables.

数据模型中的关键元素是一组统计信息，该统计信息收集了有关数据库中所包含的数据和系统目录表中所存储的数据的信息。

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And the security of defense contractors whose servers hold government secrets will be a key element in protecting U.S. data from digital espionage.

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