In the paper, analyzed the individual rekeying on key tree and key star and the server' cost on batch rekeying of key tree and key star.

目前，密钥图的方案已经被提出，其中树形结构密钥图和星型结构是两种重要类型。

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Isaksson has quickly established himself as a key star in French football, bringing rumours of interest from England and Spanish giants Barcelona.

伊萨克松在法国联赛中很快地确立了自己球星的地位，并且有谣传称英格兰的俱乐部以及西甲巨人巴塞罗那都对他有兴趣。

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The key to forming a black hole is cramming enough mass or energy into a small enough volume, as happens when a massive star collapses.

黑洞形成的关键是在一个足够小的容积内填充足够多的质量或能量，正如高量星将要爆炸的时刻。

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One key to the Star Wars phenomenon has been its never-ending cycle of releases and re-releases.

FORBES: Star Wars' Galactic Dollars

Former England star Key made 18 before falling to a controversial catch from Hamish Marshall, and could be fined by the ECB for his angry reaction as he walked off.

BBC: Captain Key hails Kent fightback

Beyond these three key brand elements, let the Star Trek story go where it wants to go.

FORBES: Three Brand Things To Look For When Watching Star Trek Into Darkness