The payload of Distribute Denial of Service (DDoS) attack changes drastically, the manual intervention of setting warning threshold relies on experience and the signature of abnormal traffic updates not timely, an improved DDoS attack detection algorithm based on Binary Stream Point Bag of Words (BSP-BoW) model was proposed. The Stream Point (SP) was extracted automatically from current network traffic data, the adaptive anomaly detection was carried out for different topology networks, and the labor cost was reduced by decreasing frequently updated feature set. Firstly, the mean clustering was carried out for the existing attack traffic and normal traffic to look for SP in the network traffic. Then, the original traffic was mapped to the corresponding SP for formalized expression by histogram. Finally, the DDoS was detected and classified by Euclidean distance. The experimental results on public database DARPA LLDOS1.0 show that, compared with Locally Weighted Learning (LWL), Support Vector Machine (SVM), Random Tree (RT), Logistic regression analysis (Logistic), Naive Bayes (NB), the proposed algorithm has higher recognition rate of abnormal network traffic. The proposed algorithm based on BoW model has the good recognition effect and generalization ability in abnormal network traffic recognition of denial of service attack, which is suitable for the deployment in the Small Medium Enterprise (SME) network traffic equipment.

A model was built to evaluate the customer value in terms of current value and potential value. This model used the Analytic Network Process (ANP) for weighting which considered the interrelationship among indexes, then calculated the customer value based on the weight and score of the indexes and then classified the customers by K-means. Taking a tobacco company for example at the end of this paper, qualitative and quantitative method was used to establish a customer value evaluation index system, ANP was used to weight indexes and classify the customers by K-means based on the evaluation result, and the marketing strategy of each customer group was analyzed at last. The proposed model can evaluate and classify the customer value more comprehensively and objectively.