From satellite systems to digital currencies, China is seeking to use new technologies to repress dissent at home and dominate its adversaries abroad, according to a U.K. intelligence chief.Unlike Britain or its democratic allies, China views technological advances as a “tool to gain advantage through control of their markets, of those in their sphere of influence and of their own citizens,” according to excerpts of a speech by Jeremy Fleming, head of Government Communications Headquarters (GCHQ), U.K.’s electronic spy agency.Beijing is building up its BeiDou satellite system, which could be used to block adversaries’ access to space or to bolster the surveillance of its citizens, according to Fleming.According to Fleming, China’s export of technology is part of an effort to create “client economies and governments” and countries that risk “mortgaging the future” by buying Chinese tech that contains “hidden costs.”Fleming’s speech came after the head of the FBI and his British counterpart delivered a stark warning in July about the security threat posed by China.“Fear of its own citizens, of freedom of speech, free trade, open technological standards and alliances — the whole open, democratic order and the international rules-based system.”China has accused the U.S., Britain and their allies of trying to block China’s rise as a world power, has denied allegations of human rights abuses or that it seeks to coerce other governments."