这是关于计算机安全与保密的pdf文件的讲解与分析。简单实用，让人一目了然。希望对有需要的朋友能起到一定的帮助的~！-This is about computer security and confidentiality of the pdf document to explain and analysis. Simple, practical, people at a glance. Hope there is a need friends to play a certain amount of