We are in the information age, the network has become our way of life. However, the living environment of the network, viruses and junk e-mail is the most helpless people of two things. Spam has become the network's second-largest killer. According to statistics, 40 percent of network traffic was occupied by spam, and its growth rate has reached 75%. It wasted in dealing with spam, more and more time to be happy unless the people's common aspiration of the spam, anti-spam technology arising.
On the whole, more or less anti-spam technology has gone through four stages.
anti-virus technology
While spam e-mail system is the first application of the Internet, but have a history of spam is not very long. Early, the Internet was just a platform for access to information, in the fourth act as the role of the media. At that time, e-commerce model is uncertain, as cover letter, the Love Bug, Nimda such a large number of e-mail worms spread. early stage
spam is the main body of the virus, these viruses send spam, and then this kind of spam filtering by both anti-virus software companies do, they will direct mail and e-mail format for analysis of the annex to the virus scan And clear. At that time, there are two key technologies, on the one hand, is an e-mail virus sample collection and analysis, extract the virus signature; on the other hand, is to carry out analysis of the e-mail format, based on BASE64 encoded to decode the message, and on the POP3 And SMTP to send and receive e-mail to analyze the agreement in order to be in agreement on the level of HIV virus in e-mail directly to monitor and stripping.
filtering technology
With the in-depth development of the Internet, e-commerce started to prosperity, the emergence of B2B, B2C, C2B, C2C business model, and so on. In the process of business expansion, various business groups began to use mass e-mail software to users to push a variety of advertising information. These large number of relatively useless spam e-mail has become the main body, has continued to this day. These junk e-mail to the real substance of the judge's spam, anti-virus does not belong to the category. As a result, anti-virus companies did not deal with this type of spam. At that time, because spam is a new thing, there is no specific business for the company to deal with spam. To deal with spam from the mail service providers, providing them with three filtering technology. First,
content filtering. That allows users to set their own filtering content, users can often appear in junk e-mail the title of what a typical keyword filter found in the filter set of keywords on the e-mail be deleted or moved to spam box .
Second, black and white list filtering. This is determined by each user's e-mail address list of black-and-white classification, users can e-mail address into the familiar white list, to be able to clearly know into junk e-mail address to the blacklist, so experienced For a period of time, we can build a black-and-white list database, you can effectively filter the junk mail known. Third,
filtering rules. In addition to content filtering and to determine the list of black and white, mail service providers also provide a more flexible Filtering way, that is, the user can more factors, such as whether there are attachments, refusing to take in an annex to the size of the scope of such e-mail To determine the rules. At that time, many enterprises in order to save things directly to filter out mail with attachments, so companies in the recruitment of the Federation of time not to biographical notes issued in the form of the annex to send such a statement.
three ways to filter the advantage of being simple, with only a few will be able to achieve code, but rather complicated to use: First, users need a lot of manual configuration, the second a long period of accumulation, and, as These rules are too rough to such an extent that will often filter out the normal mail.
spam generated an increasing number of anti-spam. As a result, some of the professional anti-spam company entered the market, dedicated to the anti-spam, has brought some of the more specialized anti-spam technology – filtering algorithm.
filtering algorithm in
filtering algorithms, the most widely used is that we often say that the Bayesian algorithm. Algorithm is based on Bayesian statistics, probability and principles of artificial intelligence to analyze spam, junk e-mail obtained through the study of the laws of statistics, which identify spam and filter technology.
Bayesian filters based on a score of the filter. However, it is not just a simple calculation of scores, but rather a fundamental recognition up. It features automatic set up tables. The principle, the first analysis of a large number of junk e-mail and a large number of regular mail, e-mail in a variety of algorithm analysis of the characteristics of the emergence of probability. When new messages arrive, through Bayesian filters, using the various features of e-mail is to calculate the probability of spam. Through constant analysis of the filter is also constantly be updated since. In this way, Bayesian filters have adaptive capacity, both automatically, the user can manually, which can adapt to the individual user. The spammers to get this kind of adaptability will be very difficult, and thus more difficult to escape the filter of the filter. Although
Bayesian filters still score some of the defective filter, but it is more optimized. Practice has proved that Bayesian filters in the client and server in a very obvious effect, the best Bayesian filters can identify more than 99.9% of spam. At present, most of the application of the anti-spam products that use such technologies.
In general, commercial companies Bayesian spam filters are learning a great deal of spam on the basis of development, so in the beginning there will be a very good spam recognition. And if they can not identify the e-mail, as long as simple to learn, so in practice very good results.
However, this method can only filtering technology to identify commercial spam, viruses, e-mail in the absence of channels for collecting samples for identification of the virus spam does not work. At the same time, in order to be able to solve the spam and virus commercial spam, anti-spam fourth stage – stage of technology there have been mixed.
hybrid technology
hybrid technology is now available in the market of the various anti-spam gateway. Gateway to hardware such as a carrier, at the same time in order to be able to filter out Bayesian methods common to spam and viruses to identify ways to filter out e-mail virus. Hardware can be used to achieve a higher rate of filter applied to a large number of enterprise network traffic. And individual users, is now equipped with e-mail virus filtering of antivirus software and Bayesian filtering e-mail client on the line.
However, no matter what kind of anti-spam technology, are trying to spam the end of the block and to determine. Obviously, although not the ultimate user or less subject to harassment, spam, spam, but still waste a lot of network bandwidth. In this case, only to better control the junk e-mail originator, the only real solution to spam.
control mode is to start through the appropriate administrative measures to control at the source. After several years of our efforts, the Internet e-mail service management has started in March last year, also achieved some results. The Jiangsu Province this year, also announced the norms of the top 10 network operators move. I believe these actions, like some virus writers will arrest some of the fans have a virus warning, though not eradicate the spam, spam, but will certainly play a checking role.
spam is a social issue, therefore, in addition to technical security, is more involved in society as a whole, there are more standardized operation of the network management.
growth rate of spam e-
Here are some tips
individual users to guard against spam methods Facts have proved that they are very effective, users need to be integrated use:
1. as far as possible to avoid in the newsgroups, chat rooms, web sites, forums, etc. Public places open their e-mail address.
2. in the personal home page, and so on need to open mail address, e-mail address can be taken on the replacement for the method can automatically collect mail address procedural failure.
3. users to apply for E-mail address, the need for an integrated use of characters, figures, thus increasing their address guessed more difficult.
4. Do not reply to spam.
5. the use of the provision of free e-mail spam filtering.
6. to send junk e-mail more frequently forwarded to the Government or industry management, to be reported.
7. to make full use of the client's anti-spam filtering.

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