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No real security on the Internet -- even the military is under daily assault - says the man the Defense Department hired to make the web more secure; Lesley Stahl reports. Also, filming on Alabama's Edmund Pettus Bridge offered director Ava DuVernay a way to anger the ghosts of racism; Bob Simon has her story. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.