[转载]使用分层防护抵御蠕虫的一条案例(英文资料)

信息来源：www.nsa.gov

For this paper, we studied current worm strategies and implementations and tried to determine whether the trends point to a significant worsening of the problem in the near future. Are worm technologies improving? Are worm attacks becoming more sophisticated? We were also interested in defensive technologies that can be used to combat the worm problem. Where are defensive technologies best applied? Should other technologies be developed to help defend against the worm problem? Ultimately, we would like to know whether a sophisticated attack can be prevented ?could current defensive mechanisms be used to defend against future sophisticated attacks?