[marcosdumay]

It does, it looks random (hight entropy).

Yes, measured data and unmarked compressed data have this same property, as do actual random data. But is does not look like 9 nines of false positive rate are a concern to those people.

[Dylan16807]

You can set the entropy to any amount you want. You need to consider encryption methods that put in at least a bit of effort to hide themselves. It could select random phrases and pretend to be a spambot.

[jacquesm]

Or it could look like the output of a Markov chain sentence generator on the topic of religion and post the messages in some well-known forum.

[marcosdumay]

Well, where's the boundary between cryptography that hides itself and stenography? Is there one?

If you include stenography, yes, it's certainly not easily recognizable. I don't think good stenography can be recognized at all, but that's not my area and I've got people contradict me at this (without further info), thus I'm not sure.

[Dylan16807]

There's not much of a boundary, but that wasn't exactly the point I meant to make. You can do something like encode as ASCII 0s and 1s and have low entropy without that hiding anything.