它们出自于坚固的基础架构组件，像Rational，这些组件安全，可以进行外部的详细审计，并且给出一致的答案。

They come from hardened infrastructure components like Rational that are secure, that can survive the scrutiny of an external audit, and that yield consistent answers.

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另外，这个体系限制了所有组件的安全影响。

Additionally, this architecture limits the security impact of any one of the components.

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实现：在此级别，可以定义sca组件的安全标识。

Implementation: at this level, you define the security identity of the SCA component.

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