The inside story of the teenager whose “swatting” calls sent armed police racing into hundreds of schools nationwide—and the private detective who tracked him down.

On its 10th anniversary, Signal’s president wants to remind you that the world’s most secure communications platform is a nonprofit. It’s free. It doesn’t track you or serve you ads. It pays its engineers very well. And it’s a go-to app for hundreds of millions of people.

The threat of cyberwar looms over the future: a new dimension of conflict capable of leapfrogging borders and teleporting the chaos of war to civilians thousands of miles beyond its front.