2A isn't upheld any more than 4A. States will just require a license for crypto and make it "may-issue". RSA will be classified an "assault algorithm" and banned in California. You'll have to pay a $200 tax stamp for each key, message capacity will be limited to 10 characters, and if your ex-wife claims you hit her then the sheriff can confiscate your hard drives until you convince a judge you didn't.