WhatsApp appears on a smartphone, Friday, March 10, 2017, in New York. If the tech industry is drawing one lesson from the latest WikiLeaks disclosures, it's that data-scrambling encryption works, and the industry should use more of it. In the past, spy agencies like the CIA could have simply tapped servers at WhatsApp or similar services to see what people were saying. End-to-end encryption used now by services such as iMessage and WhatsApp makes that prohibitively difficult. So the CIA has to resort to tapping individual phones and intercepting data before it is encrypted or after it's decoded. (AP Photo/Patrick Sison)