They can criminalize it, so that only criminals use crypto by definition. Think about tor. As a fraction of network traffic, almost no one uses it, so if you do you have singled yourself out.<p>Running an exit node is already a great way to end up in jail, and I would not have a warm fuzzy feeling about using tor for innocent traffic at this point, although it&#x27;s perfectly legal.<p>Imagine how easily flagged users could be singled out if simply using crypto were a crime, and probable cause for search: e.g. you get caught using FDE on your phone or laptop at a traffic stop or the airport. Either your info is trivially purused at will by LE, or you&#x27;ve committed a crime by makeing it difficult and can be compelled on that basis. Either way, they&#x27;re reading your mail if they feel like it.<p>The real value of this would be that almost no normal person would want to risk prosecution, so the overwhelming majority of user data could be easily mined. These are just a couple of crypto tools, but the technical details don&#x27;t really matter here, I think this is a legal and social strategy that will generalize well, and it I think this is where we&#x27;re inevitably headed.