Well, it's definitely possible to do that but I'll make no claim that it would actually provide security. There's definitely some bleed-through with noise cance

Well, it's definitely possible to do that but I'll make no claim that it would actually provide security. There's definitely some bleed-through with noise canceling (i.e. the beginning of sounds don't get canceled because the noise-canceling has a "reaction time"). It's probably better than nothing, but I would guess that a sophisticated-enough attacker could get around it. Again, I have no proof of concept here, so take with a grain of salt.