I'm amazed that they didn't discuss https://en.wikipedia.org/wiki/Steganography https://en.wikipedia.org/wiki/Steganography as an approach. There are lots of w

I'm amazed that they didn't discuss https://en.wikipedia.org/wiki/Steganography https://en.wikipedia.org/wiki/Steganography as an approach. There are lots of ways to hide encrypted data such that it is not obvious that there is any data at all to be found.