Feb
21
Web Content Filtering – What does it mean?
February 21, 2010 | Leave a Comment
To answer this question, let me by going back into history a little catch-up begin! Did you know that WWW, as we know it today, has an "Internet development ', which was originally designed quite differently. Yes, the exchange of information and files was always there, but it turned out quite differently! In fact, developed much later, Web as an e-mail. Of course, safety issues and have developed solutions in the same foot steps. We started with anti-virus check to contentE-mail and spam filter, manage, etc. to the nuisance created by unwanted e-mails, these two, we cumulatively refer to as a content filter for e-mails. Almost similar situation presents itself today, as we have the World Wide Web access, and we use Web content filtering to protect us.
The whole development is really happening on two fronts (or layers, as we actually call them from a technical point of view). The network and the application. Routers were built to connect between the different networks, and firewalls have been builtensure the connections to happen, exactly as desired. Similarly, at the application level proxy servers have been installed to the needs of different applications, service and content filters have been built to ensure that the content was acceptable nature. And technically speaking, "there are two types of firewalls – Network Layer and Application Layer", is an accurate statement. And from the standpoint of safety of these two types of firewalls are both necessary and need to do another job. But we willto come in an instant.
Content filtering helps prevent abuse, misuse, and other security breaches, users and their applications to the WWW. Paradoxically, "content filtering" is by itself a very abused term, has led to a lot of general confusion. Simply put, it means the definition of "what will be allowed or refused to be steered.
To define a legacy content filtering allows you to – his only "what" in relation to a number of web pages. While modern contentFiltering software or an application layer firewall – like SafeSquid (http://www.safesquid.com/), enables you to this "what to tackle" more holistically and comprehensively defined as the need to relax or contextually apply rules.
This definition of "what" therefore requires many more terms to be treated, not just web pages. This "what" in relation to the actual nature of the content is defined and the definition is not necessarily limited only by the Web SiteAddress.
Each proxy server is basically an application layer firewall (ALF). Each of the various filters in an ALF are individually regulated by a global rule of the Allow or Deny, and exceptions to the rule are set in the configuration of the ALF, by exactly the business and needs of the implementation. Each of the address filter "a specific aspect of the content. This is very similar in essence to a modern network-layer firewall (NLF). NLFs primitives allows you only toor deny connections based on source or destination address in the form of IP addresses and ports, but the more sophisticated developments that allow you to state protocols as parameters too, along with other factors such as time of day, and a composite safety by analyzing the content) (data packets for malware, by referring to the transported data packets to find the antivirus software or other such technologies. But the control of the content is primarily the function andResponsibility of the ALF. Some NLFs offer these functions as an additional function, because it makes the NLF convenient and interesting from the TCO perspective.
Modern application layer firewalls have a comprehensive set of specific actions, filters and processes holistically allow you to access and control over the content, how to use your resources to win. This is through the use of a variety of filters which achieved each serving a specific purpose. Some of these filters, parametricanalyze the content, in real time and then take appropriate action, while some do not require the content to actually be downloaded to take any action. Thus, the focus is more on the logic behind an action, not just the action itself
Almost all modern-day Alf offer minimal virus transmitted from the content and thus also provide a gateway anti-virus. But a typical HTTP application consists of a variety of independent or interrelated factors. Aspecific filters addresses a specific factor. Some, such as Alf SafeSquid allows you to define rules under the policy in relation to all these features. The factors that may be of general applicability, are "profiled" and then they are either exposed to (or against) immunized appropriate filter. These filters are either static or dynamic. Here is a list of some of the very important filters and their functions. Note that the function is directly linked to the conditionParameters.
* Access restriction to allow or deny create access for a user and a profile.
Basic conditional parameters: username, IP address.
Offer additional privileges such as: Global bypass to one or more filters.Access browser is based on GUI.Any other privileges, a user must always enjoy (once) to. * URL filters allow or disallow access to a given URL contents.
Basic conditional parameters: hostname, IPAddress, file name
* URL blacklists allow or disallow access to a web-content sites under a certain category
Basic conditional parameters: Category
* MIME filters allow or disallow access to a specific content of the content-type.
Basic conditional parameters: MIME type, file name extensions.
* Allow cookie filter or block the cookie exchange or from a particularDomain.
Basic conditional parameters: Cookie's – domain attribute, attribute, path, expiration time (year, month, hour, minute), direction – attributes (inbound, outbound)
* Keyword filtering without access to web sites containing unacceptable words or phrases
Basic conditional parameters: Patterns of words and phrases, score
* Replace or modify unacceptable document rewrite parts of a web page.
Basic conditionalParameters: sample content that is to be replaced, replace sample content
* Image Filter to block access to pornographic images.
Basic conditional parameters: probability threshold at which the image can be treated as pornographic
* DNS Blacklist servers from accessing content served by criminal intent
Basic conditional parameters: the IP address (for each category reported criminal intent)
– ManishKochar
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