By Eva Dou 

BEIJING -- A Chinese Internet agency criticized Google Inc. on Thursday for rejecting its website safety verification process, in the latest sign of mistrust between China and foreign technology companies.

Google said Wednesday it would no longer trust websites vetted by the China Internet Network Information Center, which administers Chinese Internet addresses. Specifically, it said it would no longer recognize security certificates issued by the agency that verify that the site serves a legitimate business. Such certificates, which are kept by the server hosting the website and read by web browsers, are meant to protect Internet users from scams such as identity theft and what's known as phishing.

Google's decision means that for users of Google's Chrome browser, any new sites authenticated by the Chinese agency will likely be flagged with warnings that say Google can't verify the website's security and that users shouldn't open the page.

The Chinese agency, known as CNNIC, said in a statement on its website that Google's decision was "difficult to understand and accept" and urged Google to fully consider the rights of users. CNNIC also said it would guarantee that its existing users wouldn't be affected.

A Google spokesman declined to elaborate on U.S. Internet search giant's statement.

Chinese suspicions over the security of U.S. technology products has been on the rise, particularly after former U.S. National Security Agency contractor Edward Snowden said U.S. intelligence agencies use such equipment when gathering information. Chinese regulators have unveiled plans to roll out a slate of new cybersecurity measures this year that would require U.S. companies to hand over source code and other proprietary information.

Google said on its official security blog post Wednesday that it decided to stop accepting CNNIC certificates after a joint investigation with CNNIC into a security breach at an Egyptian company MCS Holdings. While Google determined MCS's misuse of certificates wasn't malicious, it said CNNIC gave too much authority to a company not fit to hold it. MSC said its creation of unauthorized certificates was a mistake that it quickly corrected.

Google said CNNIC could apply for its certificates to be accepted again after improving its verification process. Meanwhile, sites that already hold CNNIC certificates will still be marked as trusted in Chrome "for a limited time," Google said, without elaborating.

The change will affect encrypted Chinese websites, which begin in "https" and end in ".cn". These types of websites encompass email, online shopping services and other sites where users enter personal information or passwords.

Google has long had a complicated relationship with China. In 2010 it moved some of its services outside of China to protest Beijing's censorship efforts. Its services has since become difficult or impossible to access within the mainland. Still, Google maintains a significant presence in China, especially in online advertising.

Write to Eva Dou at eva.dou@wsj.com

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