Users may select encryption without specifying authentication, but this action leaves the packets vulnerable to active attacks, which can lead to an outside entity breaking the encryption.

用户可以选择不用特定的认证进行加密，但是这样会让包容易受到攻击，导致让别人破坏加密。

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Although compared with the previous, improved their safety, but when faced with security attacks (passive attacks and active attacks), the whole network system security still needs to be improved.

虽然与之前相比，其安全性有所提高，但当面临安全攻击(被动攻击和主动攻击)时，整个网络系统的安全性仍然亟待提高。

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Availability is assured at the operating system level, allowing for transparent mitigation of active and passive network denial-of-service attacks.

它在操作系统级确保可用性，可以透明地缓解主动和被动网络拒绝服务攻击。

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On Wednesday, Microsoft released a security advisory warning users of active attacks using a previously unknown bug in Internet Explorer (IE) that affects users of versions six, seven of the browser.

FORBES: Criminal Exploits Targeting New Bug In Old Internet Explorer Versions

Terrorism experts said al Qaeda in the Arabian Peninsula, the terror network's most active affiliate, could launch retaliatory attacks.

WSJ: Nations Brace for Retaliation After Osama Bin Laden's Death

Qatar was among the few Arab states offering active military assistance to NATO-led attacks against Moammar Gadhafi's regime in Libya and, at the same time, was a key arms-and-money pipeline for Libyan rebels who overthrew Gadhafi.

NPR: Qatar Faces Backlash Among Rebel Groups In Syria