BEIJING — Type the Chinese characters for “carrot” into Google’s search engine here in mainland China, and you will be rewarded not with a list of Internet links, but a blank screen.

Don’t blame Google, however. The fault lies with China’s censors — who are increasingly a model for countries around the world that want to control an unrestricted Internet.

Since late March, when Google moved its search operations out of mainland China to Hong Kong, each response to a Chinese citizen’s search request has been met at the border by government computers, programmed to censor any forbidden information Google might turn up.

“Carrot” — in Mandarin, huluobo —may seem innocuous enough. But it contains the same Chinese character as the surname of President Hu Jintao. And the computers, long programmed to intercept Chinese-language searches on the nation’s leaders, substitute an error message for the search result before it can sneak onto a mainland computer.

This is China’s censorship machine, part George Orwell, part Rube Goldberg: an information sieve of staggering breadth and fineness, yet full of holes; run by banks of advanced computers, but also by thousands of Communist Party drudges; highly sophisticated in some ways, remarkably crude in others.

The one constant is its growing importance. Censorship used to be the sleepy province of the Communist Party’s central propaganda department, whose main task was to tell editors what and what not to print or broadcast. In the new networked China, censorship is a major growth industry, overseen — and fought over — by no fewer than 14 government ministries.

“Press control has really moved to the center of the agenda,” said David Bandurski, an analyst at the China Media Project of the University of Hong Kong. “The Internet is the decisive factor there. It’s the medium that is changing the game in press control, and the party leaders know this.”

Today, China censors everything from the traditional print press to domestic and foreign Internet sites; from cell phone text messages to social networking services; from online chat rooms to blogs, films and e-mail. It even censors online games.

That’s not all. Not content merely to block dissonant views, the government increasingly employs people to peddle its views online, in the guise of impartial bloggers and chat-room denizens.