By using the results of this classification, the supply for a strategy of defense to anonymous communication system can be offered, thus the anonymous degree can be further improved.
利用该分类结果，可以为匿名通信系统中的攻击提出对应的防御策略，进一步提高匿名通信系统的匿名度。
2
This paper explains the nature, source, classification and defense mechanism of anxiety from classical psychoanalysis and new psychoanalysis, and makes a brief comment about them.
Chapter one describes the classification and form of the network-security systems, analyzes the advantage and disadvantage of all kinds of defense measures.