Based on the network communication model and the characters of the worm's propagation, this article gives the attack-tree model of worm.

在网络通信模型的基础上，进一步结合蠕虫传播的特征，本文提出了蠕虫的攻击树模型。

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In order to describe Internet worm propagation, a novel subsection model of network worm propagation was put forward.

为了更好地表达网络蠕虫传播情况，提出了一种新的蠕虫传播分段模型。

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In order to better characterize the propagation of benign worm, this paper adopted a discrete-time model.

为了更好地刻画良性蠕虫的传播过程，采用了离散时间模型。

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