What are the principal measures used to protect computer security?

哪些主要措施来保护计算机安全？

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Security experts are constantly devising ways to protect computer systems from access by unauthorized persons.

安全专家不断设计新方法，用以保护计算机系统免于未经授权之人的访问。

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How to protect computer information safety, keeping secret also being information content the problem looks like growing in importance.

如何保护计算机信息安全，也即信息内容的保密问题显得越来越重要。

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They offer to protect your computer against known exploits, blocking attacks as they happen.

FORBES: Study Shows Programs Designed To Catch Hackers' Exploits Miss Nearly Half

Provide advice to governments on how to protect their computer systems and track down and arrest hackers.

CNN: Global panel issues Internet security recommendations

And just about every technical countermeasure that brilliant engineers devised to protect vital computer systems and valuable information can be accidentally or intentionally circumvented by human interaction.

FORBES: Humans: The Weakest Link In Information Security