在第一部分中，Schneier通过讨论所面对的威胁、攻击的类型、对手(比如，恶意破坏者)和安全的需要，为数字安全这个主题建立了一个上下文。

In the first part, Schneier establishes a context for the topic of digital security by discussing threats, types of attacks, adversaries (i.e., "bad guys"), and the needs for true security.

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若要将因攻击成功而导致的损害降到最低，请为您的代码选择安全上下文，以便只向资源授予其完成工作所必需的访问权限。

To minimize the amount of damage that can occur if an attack succeeds, choose a security context for your code that grants access only to the resources it needs to get its work done and no more.

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