Briar messenger is specifically designed for things like protests. I think I would prefer it over Signal. The article says:
>Signal has responded to 6 government requests since 2016, and in each case the only information they were able to provide was at most: ...
That is the all the information they claimed they had. We have no way to know what they actually collect. Briar runs P2P over Tor so they can't collect data, even if they should want to.
Whatever is used, an article like this should remind the potential protester to turn on disappearing messages with an appropriately short interval. The powers that be might use something like a Cellebrite box to get all your old messages by cracking the phone security.
>Signal has responded to 6 government requests since 2016, and in each case the only information they were able to provide was at most: ...
That is the all the information they claimed they had. We have no way to know what they actually collect. Briar runs P2P over Tor so they can't collect data, even if they should want to.
Whatever is used, an article like this should remind the potential protester to turn on disappearing messages with an appropriately short interval. The powers that be might use something like a Cellebrite box to get all your old messages by cracking the phone security.