Meta is considerably expanding Messenger's encryption feature, rolling it out to "millions more people's chats" starting today, the company announced. The end-to-end encryption (E2EE) standard, which first arrived a year ago, will be available as standard to all users by the end of 2023. Meta also described how it made the transition, calling it "an incredibly complex and challenging engineering puzzle."
The system keeps conversations safe from eavesdropping and interception using public key cryptography — meaning no one, even law enforcement, can access conversations. At the same time, your message history will also be encrypted. Meta first focused on WhatsApp, which now offers full E2EE, but Messenger will have the same level of protection by year's end.