01:07:46 PM Nov 9th 2011
There's certainly overlap. The sender of a Public Secret Message might intend the message for a specific group rather than an individual. A Public Secret Message could also be Hidden in Plain Sight. If the press isn't looking very closely, they might miss a minor change that a specific group was looking for, allowing the general public to go uninformed. However, it needs to be an actual secret, and the message needs to be clearly, deliberately sent to a very specific audience. For example, if a politician might cut a program to send a message to a racist group, but it's also possible the politician had other reasons to cut the program, it's probably best to leave the example off the page.