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Figure 1: The Structure of NN. A Neural Network (NN) is an interconnection of units or nodes,the basic element of NN is the neuron. The network processing ability is obtained by an adaptation to,or learning from, a set of training patterns.Computer security is the generic name for the automated tools designed to protect data [1]. Encryption is the most important automated tool for communications and network security. The encryption technique essentially map data to a domain in a manner that is sniffing-proof. Symmetric and asymmetric encryption are the two major techniques used in encryption. The structureof neural networks is shown in figure 1.

Figure 1 The Structure of NN. A Neural Network (NN) is an interconnection of units or nodes,the basic element of NN is the neuron. The network processing ability is obtained by an adaptation to,or learning from, a set of training patterns.Computer security is the generic name for the automated tools designed to protect data [1]. Encryption is the most important automated tool for communications and network security. The encryption technique essentially map data to a domain in a manner that is sniffing-proof. Symmetric and asymmetric encryption are the two major techniques used in encryption. The structureof neural networks is shown in figure 1.

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Figure 2: The Organization Structure of NN. depends on the differences in development progress and degree of the country. The computer network is considered as a very complicated system, as the network security can be affected by many factors. The evaluation of the network security is as follows [1,5]: at first the contents and scope of the network evaluation are identified and then initial analysis on the basic network conditions, security conditions and network vulnerabilities are performed.While the second step is to establish the related mathematical evaluation model then finallythe network security level is computed by using the mathematical model.The use of vector multiplication, the sigmoid function and other different approximation in order to realize self-organization, self- adaptation and self-learning. Those factors represent the major differences between NN and traditional method. The organization structureof NN is shown in Figure2.
Figure 2: The Organization Structure of NN. depends on the differences in development progress and degree of the country. The computer network is considered as a very complicated system, as the network security can be affected by many factors. The evaluation of the network security is as follows [1,5]: at first the contents and scope of the network evaluation are identified and then initial analysis on the basic network conditions, security conditions and network vulnerabilities are performed.While the second step is to establish the related mathematical evaluation model then finallythe network security level is computed by using the mathematical model.The use of vector multiplication, the sigmoid function and other different approximation in order to realize self-organization, self- adaptation and self-learning. Those factors represent the major differences between NN and traditional method. The organization structureof NN is shown in Figure2.
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