Well, that&#x27;s why you compress then encrypt first<p>Entropy is a good measurement <i>but it&#x27;s not the goal</i>. The goal is a smaller file size<p>Yeah, I guess that for &#x27;generic compression&#x27; the advances are going to be slow and few. Without any knowledge of the type of file it&#x27;s only bytes so you have to work with that. Also disk space and network speeds are getting cheaper, so what might have needed compression in the past might not need today (even though compression got much cheaper)