Forward security of the scheme means that even if the secret key of current time period is compromised, some security remains. It is impossible to forge the signature relating to the past.

方案的前向安全性保证了签名密钥可定期更新，即使当前时间段的签名密钥被泄漏，敌手也不能伪造先前的签名。

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It allows administrators to monitor current query activity or activity during a specific time period, such as queries that were processed today, this week, or during the past month.

它允许管理员监控当前查询活动或者某一特定时期的活动，例如今天、本周或上月处理的查询。

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Although he reiterated the threat that Libya could face a prolonged period of civil war if the current unrest didn't come to an end, many would wonder if there was a slight change of tone this time.

他多次强调，如果目前的动荡局面不尽快结束，利比亚将面临长期内战的威胁，然而，许多人想知道这次的语调是否有轻微的改变。

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Only five percent of the owners characterized the current period as a good time to expand.

FORBES: One Country, Two Economies

Only 4 percent think the current period is a good time to expand substantially, compared to an average of 18 percent between 2003 and 2007 and 17 percent for the period 1973 to 2007.

FORBES: Small Business To Obama: Give Us A Budget, Please

He says the current period is the most exciting time he can remember in 36 years working in higher education.

BBC: University changes: Threat or opportunity?