目前，我们的社会高速发展，人们对计算机网络和信息的需求与日俱增，信息安全对人们的影响越来越大。信息安全的目的主要是保障信息系统安全有效地运行，保障信息在系统中能安全有效地存储和传输。 目前影响信息安全的主要因素有： 一、通过调制解调器接入网络 外部的攻击者通 At present, with the rapid development of our society, the demand for computer networks and information is increasing day by day, and the impact of information security on people is getting bigger and bigger. The main purpose of information security is to ensure the safe and effective operation of information systems and ensure the safe and effective storage and transmission of information in the system. The main factors affecting the current information security are: First, through the modem access network outside the attacker pass