Since Donald Trump's victory last week, encryption apps have seen an increase in users — like Signal, which has experienced 400 percent growth. On today's show, we'll interview Moxie Marlinspike, co-founder of the company that created the app. In other privacy news, Chicago has started constructing a network of data sensors to monitor the city's traffic flow — but some are worried that it could be used as a spying tool. We'll dive into their concerns. Plus: We have a preview of the second season of our "Codebreaker" podcast, which launches today. This season's fundamental question about tech: Can it save us?