After analyzing the Internet Key Exchange (IKE) protocol, this paper points out that there is a security weakness in the aggressive mode of IKE phase 1, which is vulnerable to Denial of Service (DoS) attack.

The second meaning is that Catherine wants to come from the civilized world to the uncivilized world.

As a result, this novel reveals the savagery and ignorance in human nature, and exposes the fragility of rationality and human civilization.

The colonialism in Robinson Crusoe is presented on the basis of a careful analysis of the complex relations between colonialists and colonies, slaveholders and slaves, the white and the color, central culture and marginal culture, civilization and savagery, Christianity and cannibalism, Robinson and Friday, difference and multiplicit

Henry criticizes strongly the modern science and believes that the hyper-development of it leads to a new barbarism: elimination of culture and value.

This paper attempts,through analyzing the love between Cathy and Hareton,to highlight the fact that the process of civilization is that of negating barbarism continuously and finally effecting a reconciliation with barbarism,and that by means of great love,barbarism can be tamed and civilization will win at last.

The real barbarians were,however,from within the Empire.