This means that if any group of people uses the latest version of WhatsApp—whether that group spans two people or ten—the service will encrypt all messages, phones calls, photos, and videos moving among them. And that's true on any phone that runs the app, from iPhones to Android phones to Windows phones to old school Nokia flip phones.
We're somewhat lucky here in the United States, where we hope that the checks and balances hold out for many years to come and decades to come. But in a lot of countries you don't have these checks and balances," says Koum, dressed in his usual T-shirt and hoodie. Coming from Koum, this is not an academic point, as most of WhatsApp's users are outside the US.