Optimal configuration of firewall, IDS and vulnerability scan by game theory

The integrated linkage control problem based on attack detection is solved with the analyses of the security model including firewall, intrusion detection system （IDS） and vulnerability scan by game theory. The Nash equilibrium for two portfolios of only deploying IDS and vulnerability scan and deploying all the technologies is investigated by backward induction. The results show that when the detection rates of IDS and vulnerability scan are low, the firm will not only inspect every user who raises an alarm, but also a fraction of users that do not raise an alarm; when the detection rates of IDS and vulnerability scan are sufficiently high, the firm will not inspect any user who does not raise an alarm, but only inspect a fraction of users that raise an alarm. Adding firewall into the information system impacts on the benefits of firms and hackers, but does not change the optimal strategies of hackers, and the optimal investigation strategies of IDS are only changed in certain cases. Moreover, the interactions between IDS ＆ vulnerability scan and firewall ＆ IDS are discussed in detail.

瑞星杀毒软件2005（8合1组合套装）

近日,北京瑞星信息科技有限公司推出了其最新产品——瑞星杀毒软件2005版。该产品在“系统漏洞扫描”、“实时监控”、“未知病毒查杀”和“数据修复”方面功能强大，能在第一时间检测到未知病毒并保护用户系统。此外，在木马病毒查杀，网络游戏保护和智能反垃圾邮件方面，它也做了相当大的改进，更贴近个人及家庭用户的需要。

唾手可得的电脑安全工具

最近网络病毒特别多，像“冲击波”和“震荡波”等传播面广、攻击性强的病毒一个接一个，让大家的电脑防不胜防、接连中招!由于笔者把玩电脑小有成就，所以每当公司发生病毒事件时，就成了临时的“消防员”。时间一长，笔者就有了一些感触：以前，一碰到电脑安全问题，总喜欢闷着头上网到处去找安全工具，不断地下载、安装、试用……结果问题没有解决，乱七八糟的软件倒把系统给搞麻烦了；后来，仔细使用了一些常见的杀毒软件，发现它们本身就自带了一些实用的安全工具，以前苫苦寻觅的东西其实就在身边唾手可得。