WhatsApp’s end-to-end encryption Until now, messages between users were sent via WhatsApp’s servers using proprietary technology, which applied and retained the encryption keys used to scramble data. The connection was secure as long as WhatsApp itself didn’t decide to peer at the encrypted content, possibly after being served a warrant to do so by a government or police force. The company could also to do this retrospectively on old messages and files as well as future ones. The proprietary nature of the code meant that the outside world could not study what WhatsApp was doing for weaknesses or backdoors. Replacing this with the highly regarded open source Signal software from Open Whisper Systems means that the underlying technology is open to code review by anyone.

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