广域网安全解决方案

广域网上存在 哪些不安全地方? 由于广域网采用公网传输数据,因而在广域网上进行传输时信息也可能会被不法分子截取。如分支机构从异地上发一个信息到总部时,这个信息包就有可能被人截取和利用。因此在广域网上发送和接收信息时要保证: 1.除了发送方和接收方外,其他人是不可知悉的(隐私性); 2.传输过程中不被篡改(真实性); 3.发送方能确信接收方不会是假冒的(非伪装性); 4.发送方不能否认自己的发送行为(非否认)。 如果没有专门的软件对数据进行控制,所有的广域网通信都将不受限制地进行传输,因此任何一个对通信进行监测的人都可以对通信数据进行截取。这种形式的“攻击”是相对比较容易成功的,只要使用现在可以很容易得到的“包检测”软件即可。 对付这类攻击的办法就是对传输的信息进行加密,或者是至少要对包含敏感数据的部分信息进行加密。

Extraction Algorithm of English Text Summarization for English Teaching

In order to improve the ability of sharing and scheduling capability of English teaching resources, an improved algorithm for English text summarization is proposed based on Association semantic rules. The relative features are mined among English text phrases and sentences, the semantic relevance analysis and feature extraction of keywords in English abstract are realized, the association rules differentiation for English text summarization is obtained based on information theory, related semantic roles information in English Teaching Texts is mined. Text similarity feature is taken as the maximum difference component of two semantic association rule vectors, and combining semantic similarity information, the accurate extraction of English text Abstract is realized. The simulation results show that the method can extract the text summarization accurately, it has better convergence and precision performance in the extraction process.