Content filter- a device or software for filtering sites by their content, which does not allow access to certain sites or services on the Internet. The system allows you to block websites with content that is not intended for viewing.
The content filter works on a statistical basis, that is, it counts predefined words of text and determines the category to which the content of the site belongs. The purpose of such devices or programs is to restrict access to the Internet for schools, businesses, religious organizations, etc. Most often, content filters are used to restrict access for children and adolescents, in educational institutions, libraries and workplaces in various institutions, and also game clubs and internet cafes.
Principle of operation
Often filtering takes place at the level of HTTP requests. For this, the URL of the requested site is checked against the blacklist using regular expressions. Such lists must be regularly updated; protection with their help is considered ineffective. More advanced are pattern recognition and natural language processing techniques. To classify sites according to different criteria (for example, "pornography / non-pornography", "warez / freeware catalog", etc.), the text of the requested page is analyzed for the number of different keywords (for example, "free", "download", etc.). etc.). These and other text properties are used to calculate the likelihood of falling into a dangerous category. If this probability exceeds the specified level (for example, 95%), access to the page is blocked.
The simplest programs allow you to enter words that the system will search for manually. The most complex devices already have a large vocabulary and assume a ready-made base of links that are already classified. As a rule, for complex devices, manufacturers provide periodic updating of the link base. Those websites that were not automatically recognized are viewed by a person and assigned to the site category manually.
An obvious requirement for restriction programs is classification performance.
A lightweight version of the personal filter, which provides the most important functions to restrict user access to negative, unwanted and dangerous Internet resources. The most essential categories and functions for safe Internet use are supported.
a paid program that has wide capabilities and flexible customization.
http://www.kindergate.com/ - Program site.
http://www.kindergate.com/support/kindergate_setup - installation instructions.
http://www.kindergate.com/support - Technical documentation for setup and installation.
http://www.kindergate.com/download/ - You can download the program here.
free web browser extensions to help keep your child safe from inappropriate content.
http://www.mywot.com/ru - Program website.
http://www.mywot.com/ru/faq - Questions and answers.
To install this protection, you need:
Registered users have more customization options.
In this article, we will look at a multi-platform (Linux, Windows) solution for effective content filtering, its installation and configuration. This filter can be used in schools or other educational institutions.
First, a little theory, if anyone is not interested, you can move on to the next chapter. What kind of filtering is there? Traffic filtering can be of two types, server and client.
There is a dedicated computer, the Internet is configured on it, and this Internet is distributed to other computers via the local network. Filtering takes place on a dedicated computer. Known programs for organizing server content filtering:
But there is one big drawback for solutions for Windows OS, all of them are almost paid, and if they are free, like ICF, then they require the installation of a paid product.
These programs are free. But they are more complicated to set up.
On every computer where content filtering is needed, a program is installed and configured that does it. Examples:
Now let's talk about a fairly simple free method of content filtering, but at the same time quite effective. I've tried many content filtering techniques over the years, but this one has proven itself to be one of the best and easiest solutions. It can also be used in conjunction with any of the other methods as a supplement.
The Mozilla Firefox browser has many add-ons. Based on such additions, we will do content filtering.
WOT (Web of Trust) is a free browser add-on that alerts the Internet user when searching for information or making purchases about potentially unsafe web pages. WOT is compatible with such browsers as Internet Explorer, Mozilla Firefox, Opera (in version 11 with an extension) Chrome. wikipedia
This plugin also has parental controls. We will be doing content filtering with this plugin.
Adblock plus- an extension for browsers and other software based on Gecko: Mozilla (including "mobile"), Mozilla Thunderbird, Mozilla Suite, SeaMonkey, Songbird and Mozilla Prism, which allows you to block the loading and display of various page elements: overly intrusive or unpleasant advertising banners, pop-ups and other objects that interfere with the use of the site. wikipedia
Filtering online content has become a real necessity, since the diversity of information on the Internet has a dangerous scale, even for an adult. The use of special programs for analyzing and filtering traffic helps prevent unwanted information from appearing on the user's screen and restricts access to dangerous resources.
The Internet Control Server program has a wide range of capabilities for filtering Internet content, becoming an obstacle to dangerous traffic already at the border of the local network. To evaluate the full set of tools, you can download a test version for free, limited only in terms of time of use, but not in functionality.
With the advent of Federal Law No. 436-FZ, content filtering systems in schools have become not only a mandatory element, but are also subject to reliability checks. The ICS program meets all the requirements established by law for such software products. The solution uses sophisticated technologies, but the control of the program is simple and understandable to the user without special knowledge. Together with technical support, we get a reliable and modern content filtering system for school, office or home.
As a content filter:
In general, "Internet Control Server" is, in essence, a VPN server, and solves all the tasks typical for organizing a full-fledged and secure local network:
Ultimately, the management of an educational institution covers all the needs for organizing a local network of an educational institution - from content filtering to absolute control over events taking place in the network.
There is a lot of good and useful information on the Internet. Now people have begun to look more often on the Internet to find out the latest news, weather forecast, see the form (instructions on how to do something), recipes for cooking, or just find out how to screw a light bulb into a chandelier. There is a lot of information on the Internet, just have time to enter all kinds of queries into the search box of Yandex or Google. But among the useful information, there is harmful and obscene in the form of images, obscene text and videos.
It is very important to fence children off from such content, since recently a lot of information has appeared that disturbs the psyche of a child beyond recognition. The first step, of course, is to keep an eye on the parents for the child at home, and the teachers at school for what sites he visits on the Internet, conduct conversations, and so on.
But not always, it turns out, to keep track of the child, therefore there are content filtering systems (SCF). Today, a lot is offered on the SCF information technology market, for example, one of the popular services SkyDNS- paid and partially free content filtering system for schools, offices and homes.
You can also use the absolutely free Internet access system.
- a centralized system of content filtering and Internet access control, with the help of which you can create protection for children from obscene information, images, videos and prohibited sites (+18) and plus protection from viruses (since such sites often contain malicious programs). Simply put, Rejector is a DNS server with the ability to remotely and centrally manage it.
The Rejector service has the following features:
To use all the functions of the Rejector service - blocking unwanted sites and content, you need to register with all the necessary data.
After registration, the content filtering system control panel will become available to you. And you can start managing the web service. Everything happens centrally, that is, from your computer.
First of all, go to the section "Networks" and make settings:
Explanation:
A static IP address is the permanent address of your computer with no time limit when connecting to the Internet. Issued by the provider and is mainly prescribed by the user in the settings of the computer or router.
A dynamic IP address is a non-permanent (changeable) computer address that is assigned automatically when the device is connected to the network and is used for a certain period of time.
Static IP is simple, it appears in the upper right corner. It must be copied and pasted into the Ip-address field or viewed.
With dynamic addresses, everything will be much more complicated, because they can change every day, and some providers have it in their settings so that every 3-4 hours.
To configure a dynamic ip-address, it is recommended to use the web service dyn.com/DNS/, although as I noticed, it became paid. You can also search free dyndns online. Windows operating system users can use Rejector agent .
In the next articles, I will try to write how to configure automatic detection and updating of dynamic addresses.
Chapter "Filtration" you can choose the whitelist and blacklist that suits you, according to which the content will be filtered. There are ready-made ones: office filter, children's filter, bladeless filter and others.
By choosing you can configure content filtering by individual settings, that is, select the categories of sites that will be blocked.
In chapter "Exceptions" you can modify the list of sites that need to be blocked, or vice versa, to which there must be access on the Internet. To put it simply, the finalization of the white and black lists.
The "Statistics" section is designed to track the number of requests for URLs of sites, blocked web resources, erroneous requests for a certain period of time (the user can set the required period of time).
In the "Requests" section, the administrator receives messages from network users on a request to open (unblock a site). Users can submit requests from the block page. By the way, the blocking page can be configured in the "Networks" section by clicking on the link Tune in your ban page.
The section "Time interval" is devoted to the settings with the time of operation of content filtering in the network. For example, you can configure the Rejector service not to block sites after 17:30, etc.
To clear the cache in Windows, you need to run the command ipconfig / flushdns.
After the steps described above, we can say that most of the work has been done to fully filter content.
It remains to configure the network adapter in the operating system that is installed on your computer, or to make settings in the router (router).
There is absolutely nothing left to fully launch the Rejector content filtering system on your computer or in an organization (office, school). You need to register the Rejector DNS servers: 95.154.128.32 and 78.46.36.8. Without this, you will not be able to filter prohibited sites and content.
Configuring DNS Servers for Using Rejector in Windows (Windows XP, Windows Vista and Windows 7) is written. Therefore, I see no point in writing a new instruction. There you can find step-by-step instructions with screenshots.
But I did not find the router settings for Rejector on their website. There are a lot of routers and therefore there is no way to describe each router. An example is presented instructions for setting up a router (router)D-Link DIR-300NRUB5.
Next, the administrative panel of the router will open in all its glory, where you can make settings. If you already have a router configured by your provider or by yourself and you have access to the Internet, then you need to make changes to the name servers (in this case). To do this, go to the "Advanced" menu section and select "Name servers". Next, as shown in the screenshot, enter the DNS of the Rejector server: 95.154.128.32 and 78.46.36.8 .
We save the changes and reboot the router for the settings to take effect!
For example, I recently set up. In the control panel of this router, go to the menu section "Net", Further WAN and into the fields preferred and alternative DNS server enter the corresponding DNS servers of the Rejector.
If you have any problems in configuring your router, write in the comments below, we will try to help you configure context filtering.
If you do not want to spend money on a content filtering system for your home, small office or school (educational organization), then the Rejector service will be the right tool for you to block computers from unwanted content on the Internet.
Write in the comments how you protect your children and what tools you use to block unwanted sites on your computer.
So that the user can safely surf the network, special programs have been developed to filter traffic and web content.
The main purpose of a content filter is to restrict access to prohibited or malicious resources. This is achieved with the help of lists of allowed / prohibited resources.
Every user needs protection, but children and adolescents need it especially badly. Indeed, on many pages there are scenes of violence, eroticism, advertising of harmful substances and alcohol. To protect children from such information, it is necessary to use a content filtering system.
Our company has developed a special mechanism for filtering Internet traffic, which not only helps to maintain network access in working order, but also ensures the continuity and integrity of business processes. The web filter allows you to control the flows entering the local network, automatically reducing its load. At the same time, the problems of inappropriate access to extraneous resources, irrational use of the network and working time are removed.
A filtering system for Internet traffic is needed at different levels: for home use and for a corporate network. It exists in different forms:
The company "A-Real Consulting" is actively developing various ways to ensure network security, providing customers with a comprehensive solution. We have extensive experience in implementing Internet content filtering systems in schools and organizations.
Our content filter works on the basis of web traffic data reported by the proxy server module. Then there is a check with the list of prohibited resources. This database includes several million sites, divided into categories, which allows you to customize the filtering parameters for web content.
For users of the Internet Control Server filtering system, it is enough to simply disable a category, and all sites on this topic will automatically become inaccessible.
Content filtering also includes anti-virus modules, automatically scanning all incoming traffic for malware. Our solution guarantees reliability and security by providing all the tools to control network access.
According to statistics, more than 100,000 educational institutions have access to the Internet, where students are exposed to a stream of aggressive and potentially dangerous content. Therefore, the Federal System for excluding access to Internet resources incompatible with the tasks of upbringing and education of students in the Russian Federation (SID) was approved and approved.
In accordance with Federal Law No. 436 "On the Protection of Children from Information Harmful to Their Health and Development" and Federal Law No. 139 "On Amendments to the Federal Law" On the Protection of Children from Information Harmful to Their Health and Development ", the installation of content filtering in an educational institution is a requirement.
Filters for the Internet can be configured in 2 ways:
In the second case, you will have to independently download and configure a content filter for a school or other organization. Our company offers to use the ICS Internet gateway. It is regularly updated and contains addresses of resources with information, the distribution of which is prohibited in the Russian Federation, i.e. complies with Federal Law No. 139 "On Black Lists".
Another advantage of IKS is ease of installation and configuration. To do this, you need to complete only 5 actions:
It's so easy to set up Internet filtering, providing full protection against external threats.
