We are excited to announce that we are implementing end-to-end encryption for all personal chats and calls on Messenger and Facebook. This means that your conversations will be even more private and secure. Our end-to-end encryption is built on strong cryptographic principles, such as the Signal Protocol, and our own innovative Labyrinth Protocol. We have taken our time to ensure that we get this right, working diligently with experts and conducting extensive testing. In addition to enhanced security, we are introducing new features that allow you to have more control over your messaging experience. These features include the ability to edit messages, higher media quality, and disappearing messages that last for 24 hours. We are continuously working to improve and provide a safer, more secure, and private service for our users.
https://messengernews.fb.com/2023/12/06/launching-default-end-to-end-encryption-on-messenger/