The question is not if the government can make the software you describe illegal. The question is if the government can forbid Apple/Google/Microsoft from makin

The question is not if the government can make the software you describe illegal. The question is if the government can forbid Apple/Google/Microsoft from making it the default. Existing warrant processes do not get you to the system I describe, because it is not settled law yet whether or not the government can legally compel you to surrender your key, even in cases where there is no dispute that there is a key. The fact that there exists hypothetical software that would allow someone to plausibly dispute the existence of the key is not relevant to the above question.