[TheCoreh]

>As Whatsapp does not send any alert of key change by default

I don't think that's the case. AFAIK WhatsApp does warn people about key changes with this warning message by default: https://cldup.com/QdUQmjJoF9.png

In fact working with software, at least once a month someone will ask me "Hey, what is this 'Security code has changed' message that pops up every so often about? Do I need to worry about it?"

[aylons]

Apparently, this is not default behavior anymore. Must be set in account - > Security.