WhatsApp rolls out full encryption to a billion messenger users

In the wake of Apple's encryption battle with the FBI, the latest version of Facebook's popular messenger tool will add strong encryption to texts and calls

WhatsApp is updating its messenger app so that every text and voice call on one of the world's most popular apps will be protected with strong encryption - potentially putting millions more conversations outside the purview of authorities.

The development at the messenger company, which is owned by Facebook, is striking given Silicon Valley's recent staredown with authorities over user data privacy.