One subtle aspect of secure systems is the concept of validating the target of a request.

安全系统的一个较为微妙的方面是验证请求目标的概念。

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If Sony had built more secure systems, it would not find itself being mocked in the public square.

如果索尼事先构建了更为安全的系统，那么它就不会发现自己沦为在公开场合遭到嘲笑的对象。

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Though this file is ACL (Access Control List)-protected by root only access, it may not be enough for highly secure systems.

尽管这个文件由 ACL (Access Control List) 保护，只允许根用户访问，但是这对于安全性要求高的系统可能不够。

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He also realizes that corporate customers need super secure systems.

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In fact, the authentication techniques used to identity the king are similar to the identity-management techniques we apply in software and hardware to secure critical systems and applications.

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