Steganography is the practice of representing information within another message or physical object, in such a manner that the presence of the information is not evident to human inspection. The advantage of steganography over cryptography alone is that the intended secret message does not attract attention to itself as an object of scrutiny.

I decided to give this cultist an eastern fortune teller style costume. This person has found ancient texts which describe humans as having primarily primate features. They have come to the conclusion that primate humans are the rightful inheritors of the planet and should be treated as such.

...but this guy's an iguanid human?

This cult believes some crazy things, but at least they seem harmless enough.