Content filtering is monitored for web content, prevent certain content on the network for transmission technology. Main realization have software and hardware two kinds.
Software filter mode
Content filtering software ways mainly is a 1995 started off with technical standards "Internet content choice platform," which is composed by a nonprofit Internet open business alliance, the world wide web consortium (W3C) for lifted by the end of 1995 on the introduction of the U.S. the communications decency regulations (the regulations and 1997 veto) threat and roll out. Internet content choice platform design concept is to encourage the free expression, the rights to protect minors, the tools to parents or others, let them for yourselves and for your children filter content.
This kind of tool while can also bring children or employees sent inappropriate messages filter out, such as family address, credit card number, or confidential information, etc.
Software filter main use keywords matching methods, the specific content removed. As the Internet application, the launch of the software filter cannot handle rapid increase of flow, hence hardware filter arises at the historic moment.
Hardware filter mode
Hardware filter way will keywords function integration in control have matched the switch or router of flow in the flow, in order to monitor network.
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