Pretty much: Odds are that, if you roll your own, you’ll make mistakes which make your code trivial to break for a motivated attacker that is willing to put the effort into targeting you personally.<p>It’s also quite possible that the NSA&#x2F;GCHQ&#x2F;5-Eyes will notice that your communications are &#x27;interesting, because different&#x27; and mark them to be stored in perpetuity in case they ever do decide that you’re of interest so that they can go back and break it all then.<p>So, how lucky are you feeling?