Open Whisper Systems >> Blog >> WhatsApp's Signal Protocol integration is now complete

By default, WhatsApp users have the option to verify the authenticity of their encrypted session. Like Signal, this can be done by either scanning a QR code or by reading a string aloud. We've updated the Signal Protocol to support a fully numeric fingerprint format, which we call "security codes" in WhatsApp. A fully numeric fingerprint format has a few advantages: