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Key management is the core problem of network system security, which deals with the correlative problems from key being generated to ultimately destroyed; it includes system initialization, key generation, key encasement, key distribution, key storage, key renovation, key destruction, etc. Thereinto key distribution and key storage are the two most intractable taches of key management.

密钥管理问题是网络系统安全中首要的核心问题，它是处理密钥自产生到最终销毁的整个过程中的有关问题，包括系统的初始化，密钥的产生、装入、分配、存储、更新、吊销和销毁等内容，而密钥的分配和存储是密钥管理中最为棘手的两个环节。

One Player Hit: space Left:arrow left Right:arrow right Jump: hold and release arrow up for more height Splits:arrow down Play vollyball,!

一名球员点击率：空间左：左箭头右：右箭头转到：保持和释放更多的箭头为高度分割：箭头向下播放排球，！

Press the down arrow key, the right arrow key, or the Page Down key on the keyboard.

按键盘上的向下箭头键、向右箭头键、或 Page Down 键。

The method includes steps: digital watermark technique is adopted to hide information of key data in not key data codes of compressed image; under protection of digital watermark, using protective backup for key data detects whether normal transmitted key data is correct or not so as to detect error code; carrying out cyclic mutual backup by using macro blocks in same positions in front and back macro block set; embedding coded motion vector in form of digital watermark to DCT transformation coefficient, and ensuring that video data are not influenced as best as one can; when error code occurs, if key data backup is correct, then the backup replaces former key data; otherwise, using mean value of key data in adjacent macro blocks within same frame to replace former key data approximately.

本发明中，采用数字水印技术在压缩图像的非关键数据编码中隐藏关键数据信息；通过数字水印保护下的关键数据保护备份来检测正常传输的关键数据是否正确，由此来检测传输误码；用前后宏块组中相同位置的宏块进行循环相互备份；对运动向量进行编码，然后以数字水印的形式嵌入到相对不重要的DCT变换系数中，同时保证视频数据尽量不受影响；在误码发生时，如果关键数据备份正确，则直接替代原关键数据，否则用同一帧内相邻宏块的关键数据的平均值近似替代原关键数据。

He laid the notch of the arrow on the oxhide bowstring, and drew both notch and string to his breast till the arrow-head was near the bow; then when the bow was arched into a half-circle he let fly, and the bow twanged, and the string sang as the arrow flew gladly on over the heads of the throng.

他运气开弓，紧捏着箭的糟口和牛筋做就的弓弦，弦线紧贴着胸口，铁的箭镞碰到了弓杆。他把兵器拉成了一个拱环，借大的弯弓鸣叫呻喊，弦线高歌作响，羽箭顶着锋快的头镞飞射出去，挟着暴怒，呼啸着扑向前面的人群。

The button with the arrow pointing left promotes the list entry by one level (for example from Outline 3 to Outline 2), the right arrow button demotes the list entry by one level, the up and down arrow buttons move the list entry.

指向左的箭头按钮将列表项提升一级（例如从大纲3提升到大纲2），指向右的箭头按钮将列表项降低一个层次，向上和向下箭头按钮移动列表项。

The button with the arrow pointing left promotes the list entry by one level (for example from Outline 3 to Outline 2), the right arrow button demotes the list entry by one level, the up and down arrow buttons move the list entry.

使用文本格式编辑工具栏中的四个箭头按钮来移动文本至合适的位置，并以合适的大纲级别来对文本进行编辑。左箭头按钮用於放大一级串列项，右箭头用於减小一级串列项，上下箭头用於上下移动串列项。

The button with the arrow pointing left promotes the list entry by one level (for example from Outline 3 to Outline 2), the right arrow button demotes the list entry by one level, the up and down arrow buttons move the list entry.

使用文本格式编辑工具栏中的四个箭头按钮来移动文本至合适的位置，并以合适的大纲级别来对文本进行编辑。左箭头按钮用於放大一级串行项，右箭头用於减小一级串行项，上下箭头用於上下移动串行项。

The button with the arrow pointing left promotes the list entry by one level (for example from Outline 3 to Outline 2), the right arrow button demotes the list entry by one level, the up and down arrow buttons move the list entry.

使用文本格式编辑工具栏中的四个箭头按钮来移动文本至合适的位置，并以合适的大纲级别来对文本进行编辑。左箭头按钮用于放大一级串行项，右箭头用于减小一级串行项，上下箭头用于上下移动串行项。

The button with the arrow pointing left promotes the list entry by one level (for example from Outline 3 to Outline 2), the right arrow button demotes the list entry by one level, the up and down arrow buttons move the list entry.

左箭头按钮用于放大一级串行项，右箭头用于减小一级串行项，上下箭头用于上下移动串行项。

A carrier gas such as nitrogen is directed through line 20 and valve 22 to connect with line 26 and mix with the gas sample.

如氮气之类的载体通过管线20和阀22引入，与管线26相通，与气体样品混合。

But for the most part, knaves and parasites had the command of his fortune

然而支配他的家产的大多是恶棍和寄生虫。