Google has begun routinely encrypting Web searches conducted in China, posing a bold new challenge to that nation’s powerful system for censoring the Internet and tracking what individual users are viewing online.

The company says the move is part of a global expansion of privacy technology designed to thwart surveillance by government intelligence agencies, police and hackers who, with widely available tools, can view e-mails, search queries and video chats when that content is unprotected.

China’s Great Firewall, as its censorship system is known, has long intercepted searches for information it deemed politically sensitive. Google’s growing use of encryption there means that government monitors are unable to detect when users search for sensitive terms, such as “Dalai Lama” or “Tiananmen Square,” because the encryption makes them appear as indecipherable strings of numbers and letters.Google Expands Search Encryption Globally, Including China [washingtonpost.com]