3 ms·

At the very least, Signal notifies on rekeying and in both the desktop and Android versions it doesn't appear to be changeable.

• indigo945 8y ago
  WhatsApp also notifies on rekeying. A yellow message is shown warning that "your conversation partner's security codes have changed" or something of the sort.
  • kikoreis 8y ago
    It's an option. And it's disabled by default.