Implementing end-to-end encryption was a challenging task that took several years to complete. In a blog post, Meta explains that the process involved transitioning to a new server architecture and rewriting the code base to work across multiple devices, rather than just the server. Meta had to rebuild over 100 features on top of the updated code stack to support encryption. One example given is the integration of rich URL previews, which were previously pulled by Meta’s servers. Now, the Messenger app itself visits the shared URL, retrieves the necessary information, and displays the preview. Although this adds a bit of extra time, the entire feature pipeline has been redesigned to accommodate end-to-end encryption without compromising on functionality and privacy.

In addition, Meta is testing an on-device recovery option for encrypted chats. This feature requires users to set up a PIN or generate a code. Meta is also exploring the option of enabling users to save these chats on a third-party cloud storage service like Apple’s iCloud. While end-to-end encryption for Instagram direct messages is currently in the testing phase, Meta’s safety chief, Antigone Davis, mentioned in an article for The Telegraph that the chat privacy feature will be implemented for Instagram DMs by the end of 2023.