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有关获取敌方的帐号口令进入敌方的系统以及防止敌方获取我方的帐号口令并进入我方系统的技术，是信息战中最基本的、影响巨大的攻防战术。帐号口令的窃取和反窍取战争是信息战中敌我双方争夺“信息绝对制高点”的战争。本文探讨了从帐号四个途径入侵的方法，并介绍了一个非法获取口令的实例──Morris的发明的“蠕虫”。文中还阐述了防止非法获取口令的策略，并较详细地介绍了Win－dowsNT上可实现的帐号管理的安全策略。
The technique of getting an enemy’s account password into an enemy’s system and preventing the enemy from gaining access to our account’s password and entering our system are the most basic and powerful offensive and defensive tactics in information warfare. The theft of account passwords and counter-instructing for war is the war where both sides of the enemy and ourselves compete for “information absolute high ground” in the information war. This article explores ways to invade from the four ways your account number, and introduces an example of illegitimate access to passwords - the “worm” of Morris’s invention. The article also describes the strategy to prevent illegal access to passwords, and describes in more detail the security policies that can be implemented on Win-dowsNT account management.