Mechanism of China's Internet censorship system "Great Firewall"
China has "Great firewallIt is a well-known fact that there is an Internet censorship system that blocks inconvenient information by the Chinese government called " Infographics gathered in an easy-to-understand manner how such censorship system worksBackgroundCheck.orgIt is made by people's hands.
How the Great Firewall of China Works
According to the December 2012 report, the Chinese government is doing ongoing efforts to prevent Internet users from accessing politically inconvenient information, and the Great Firewall (Kim) is steadily strengthening about.
◆ What is the Great Firewall?
The Internet censorship system by the Chinese government called abbreviated GFW, or Golden Shield (Jindeung) is aiming at "online critical criticism" and "immoral culture that corrupts people" and monitors the Chinese people Websites that violate the constitution of the Republic or are criticizing the upper part of China are closed down.
◆ What kind of content is blocked?
Thirty thousand Chinese police police officers were asked about politically sensitive issues, awkward news, press websites, online messages from dissidents, political enlightenment sites, criticisms on SNS All posts of contents of content "" religious site "" porn "are being monitored.
◆ Block breakdown by content
GreatFire.org monitors what sort of things are blocked, for example, "websites" are blocked by 46 of 978 websites, including Twitter, Facebook and YouTube Confirmed. In the domainMacys.com(Department store) ·IMDB.com(Database of movies and TV programs) ·Urban Dictionary.com(Dictionary), 1782 out of 19 6975 are blocked, and Wikipedia blocked 218 pages such as "anti-communism" "China" "Internet censorship" out of 411 pages.
◆ How does the firewall work?
1: Block DNS
The Great Firewall is divided into four stages. The first row is a block at the DNS stage, and if you type in the URL, DNS will go for looking for the target IP address, but if this URL is blocked, the DNS responds with "no IP address" , So the user can not open the site.
2: Monitor connection phase
Even if you pass DNS, the monitoring system checks the IP address of the connection destination, so if you are in a prohibited IP address, the connection request will be interrupted.
3: Block URL keyword
Even if the URL is not on the blacklist, if the prohibited term was included, the request will be reset.
4: Page scan
Even if the requested URL opens, the surveillance system will scan the page thoroughly and check whether it is okay to see it.
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