The govt has the ability to crack any encryption system please don't doubt that. I operate under the premise that this business isn't worth it to them. Actual terrorists maybe. My she purity concerns are random words getting picked up and noticed and LE somehow having logs/records released to them AFTER they are making a case. Honestly I don't think q hypothetical fictional other person gets caught through their communications. I think that the communications are part of the case that gets built around them. If they do get caught through communications it is be sure they are unknowingly corresponding with LE not because LE has unleashed the giant encryption cracker robot against their email provided.