Analysis of the site is linked to black chain hazards and preventive measures

Speaking of black chain, I believe that the promotion of people have heard, I think for any one webmaster, their site is hanging black chain is a very depressing thing, not only affect the user experience, but also let the site down right or even K station. Today, I would like to analyze the site is linked to the harm of the chain and prevention measures, I hope to help.

First: First of all, say it? The definition and harm of the chain.

Black chain is different from our regular friendship links, it is not visible on the surface of the page, only in the page with code to see the link. This code is not visible to users, but search engines can crawl, so even if we do not see the black chain when browsing the web, but these black chain has played a role. So how does the black chain come about? This usually has to do with another "black", that is, hackers. Hackers use their own technology to invade the server, on the inside of the site hanging horse, the site is put on the black chain. Because of the concealment of the black chain, the administrator is often difficult to find, so it can be stored for a long time. Black chain has become a link to buy and sell a major commodity, many sites in order to quickly improve rankings are choosing to buy cheap and a large number of high weights of the black chain. is linked to the black chain of the site due to export too many one-way links, it is easy to be found by search engines, is often done to reduce the right to deal with or keyword rankings disappear.

Second: The site is linked to what sort of chain.

In fact, in most cases, the black chain is implemented by adding CSS styles to the site's source code. Although the method is more and complicated, but basically can be divided into four categories.

The first category is to set the display property to none, so as to screen the external link information;

The second category is less technical content, just the link character set to infinite small, trying to get rid of the webmaster;

The third category is to start from the visual, but also belong to no technical content, will link characters and Web page background color Consistent, the principle seems to be consistent with the keyword accumulation; the fourth category through link location, so that links appear to the visible screen, to achieve the black chain effect.

Third: How to effectively prevent the site from being linked.

Many of the hackers carried out black chain operations are basically done through the above means, no matter what they are in the purpose of business or fun, we are unable to control. For those who have a higher PR value of the site, should pay attention to prevention. A new site, its own weight is not high, links will not play much role, but the PR in more than 4 of the site, hackers can take to hang black chain to make money. Perhaps inadvertently, your site is linked with bad information outside the chain, and this kind of outside the chain is generally not found, unless you are very professional technicians. What we can do is to strengthen our own safety measures, as far as possible not to let others use our negligence, then from my point of view, a common webmaster how to reduce the possibility of "attack"? I have summarized several commonly used measures below, as recorded below.

1. Regular view of the site source code is a good preventive measure, as if we check the performance of the friend chain every day, home source code is also one of the day-to-day work. specifically to the homepage and the weight of higher page check, once found unfamiliar URLs must carefully look at the form of links. Once you find the anomaly, delete it immediately. Check it once a day, because even if you are hung up, one day's time will not make a big impact on your website.

2. Reasonable use of webmaster tools, do not use these tools only to query included, rankings, in fact, these software has a lot of practical functions, such as Webmaster's Home station tool dead link query is very, by looking at we can know what the page has no access to the links, and these inaccessible links are mostly black chain.

3. Detailed observation of the site space file modification time, when the site is mature, we usually do not easily modify the first page settings, but if we find that the time of the change in the space file has become a recent, then we have to be careful, because this time may be hacker attack, so to download and view the source code. However, this situation on the site of the asp+access site is not very suitable, because the timeliness of such a site is too strong, a user's click may be modified to the database. Therefore, we usually have to modify the FTP password and background login password, and do not use the same password.

4. Pay more attention to the security monitoring function of space service providers, because even if the webmaster is very concerned about the maintenance of the site, the site may be linked to the black chain of the situation, such as the space service provider's security protection function once seen, then the site will be hung black chain, so in the case of hanging black chain, in addition to strengthen their own website detection, Also want to see under the same IP site has the same experience, if there are certain to fundamentally solve.

In fact, with the development of search engines, the black chain should withdraw from the stage of history, after all, its role is less and more side effects. And for some want to buy black chain webmaster, or do stand, after all, white hat method SEO is the right way.