| Summary: | 碩士 === 大同大學 === 通訊工程研究所 === 97 === This thesis introduces an innovative method, which uses Iptables module of Linux system to establish filter rules that can effectively block encryption Instant Messenger, Skype and QQ. Because Skype and QQ use encryption and private communication protocol, Employees like to use Skype and QQ for not being managed. It is result in information security of managing industry network, so there are every kind of solution on the internet, like blocking particular servers, restricting public ports on network, and analyzing packets for figuring out packet specific. But these solutions can not block Skype and QQ completely in fact. However, this paper provides the solution of using free Iptables to certainly block encryption Instant Messenger, Skype and QQ with no need of extra cost. In the end of this paper will explain the reason why the prior blocking solutions failed, and mention this paper’s experimental result in different environment.
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