I'm curious about how searching for messages works in WhatsApp considering all messages are end-to-end encrypted. Since WhatsApp can't see the content on their side, how can they allow searches? I assume sending all messages to the device isn't practical. What's the process here?
1 Answer
You can use techniques like encrypted indices or order-preserving encryption. This allows searching directly on the server without exposing the data, while still keeping everything private.
That sounds interesting! I'm working on a project that involves encryption and would love to learn more about implementing efficient search!