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The use of deepfakes to impersonate high-level officials in the U.S. presents a growing security challenge. Deepfakes also disrupt corporate boardrooms and family living rooms. Advances in artificial intelligence mean it's easier and cheaper than ever before to create lifelike audio and video. These deepfakes can be used for gaining access to sensitive systems, for committing corporate espionage and for stealing national security secrets. But the size and scope of the problem are also prompting research into the best ways to counter it. Tech companies say new programs will help governments, businesses and everyday people detect deepfakes and ensure the people they see on the screen are who they say they are.