Also worth mentioning that, in the time since this article was written, Signal Messenger is now post-quantum secure [1], and has always been free and actually o

Also worth mentioning that, in the time since this article was written, Signal Messenger is now post-quantum secure [1], and has always been free and actually open source. [1] https://signal.org/blog/pqxdh/ https://signal.org/blog/pqxdh/