If you need ultimate privacy and true end to end encryption , PGP is your tool. You can use over channels you don't trust, e.g. you can easily send PGP messages

If you need ultimate privacy and true end to end encryption , PGP is your tool. You can use over channels you don't trust, e.g. you can easily send PGP messages over Signal or other messenger you can't verify. Only people to discourage use of PGP would be gov reps, as you can choke messenger company to give you a tap to messages, but if someone uses PGP over it, tough luck.