Bravi. Wired ha un lungo articolo a riguardo:

Encryption is widely available to anyone motivated to use it, but WhatsApp is pushing it much farther into the mainstream than anyone else. Apple, for instance, encrypts the data sitting on an iPhone, and it uses end-to-end encryption to hide the messages that travel over its own iMessage texting service. But iMessage is only available on iPhones. Over the years, Apple has sold about 800 million iPhones. But it’s hard to know how many are still in use, or how many people who have them are communicating via iMessage anyway. WhatsApp runs on just about every kind of phone. Plus, Apple’s techniques have some gaping holes. Most notably, many users back up their iMessages to Apple’s iCloud service, which negates the end-to-end encryption. WhatsApp, meanwhile, has a billion users on its service right now.