The Chinese government is stirring trade tensions with Washington with a plan to require foreign computer security technology to be submitted for government approval, in a move that might require suppliers to disclose business secrets. Rules due to take effect May 1 require official certification of technology widely used to keep e-mail and company data networks secure. Washington complains the requirement might hinder imports in a market dominated by U.S. companies, and is pressing Beijing to scrap it. [Washington Post]