It would be trivial to build a bot that can send a stream of normally-looking messages with secrets steganographed into the stream. Or if you need to send more

It would be trivial to build a bot that can send a stream of normally-looking messages with secrets steganographed into the stream. Or if you need to send more data, send a picture which offers ability to hide even more encrypted content into it. I wish a good luck any government agency that tries to analyse bits of selfies exchanged by people to try to figure out if they are actually using it to coordinate nefarious activities.