is it right to call this end to end encryption? like the last thing I heard about this messenger, is that basically the code to unlock the decryption key for msgs is 4 digit pin, which seems as secure as using caesar cipher for “end-to-end encryption”
Yeah that’s correct. They say it’s protected and can’t be brute forced because of the Juicebox protocol they use and the HSM they use to rate limit the attempts, but a 4 digit PIN could be guessed and that would mean all your chats are decrypted. There’s not even forward secrecy so all your previous messages will be compromised as well.