The Cipher Daily Brief Get a daily rundown of the top security stories delivered to your inbox Monday through Friday with exclusive briefs and columns on what matters most to you and your organization. SIGN UP FOR The Free NewsletterSign up The Case for Powerful, Intermittent Cyber Response March 9, 2021 The Newsletter Walter Pincus is a contributing senior national security columnist for The Cipher Brief. He spent forty years at The Washington Post, writing on topics from nuclear weapons to politics. In 2002, he and a team of Post reporters won the Pulitzer Prize for national reporting. OPINION — When it comes to cyberspace, “the United States is on the defensive,” James A. Lewis, Cipher Brief Expert and Director of the Strategic Technologies Program at the Center for Strategic and International Studies (CSIS), told the 2021 Cyber Command Legal Conference last Thursday.