Even encrypted email allows for traffic analysis. But if you can hide communications in photos stored on, say, flickr, then nobody knows that communication bet

Even encrypted email allows for traffic analysis. But if you can hide communications in photos stored on, say, flickr, then nobody knows that communication between individuals is occurring. And because the images are publicly available, even when the authorities figure out what was happening and look into server logs, there's going to be a lot of noise in there, so they probably won't be able to say exactly who was receiving the messages. (I suppose if there are many messages, they could do some cross-correlation between them, but I also suppose that savvy bad guys would expect that and take measures to make that noisy as well.)