I mean, you know how everyone carries a phone these days? If you use your voice, it could be potentially recorded.
So… we could just use sign language. Teach everyone sign language, use that whenever you wanna say something anti-government.
Its much easier to cover up cameras (or move out of sight) than to cover up microphones. And its unlikely people would want to leave their expensive phone in another room out of sight, so teaching everyone sign language seems like a straight-forward option.
Also, bonus: its very helpful for people with hearing problems if everyone knew sign language.
That’s the equvalent of using ROT13 for encryption. Doesn’t do anything. They could literally build an automatic program to convert it back to the intelligence agency’s language.
Sign language can literally avoid the data from being picked up microphones, doesn’t even need encryption if they never have any data to work from. (Just remember to either leave the phone in your pocket or place an object over it to cover the camera)