This might be a bit of a stretch, but if you were to send in plain text just something meta-ish like datetime and the actual message would be sent as image for example, could we get around this?
E.g. when your-favorite-three-letter-agency comes asking for decryption you just decrypt the plaintext portion for them?
E.g. when your-favorite-three-letter-agency comes asking for decryption you just decrypt the plaintext portion for them?