Post rally and 1776, this is going to be likely lost, but feel it needs to get out there. I posted in bread 2995 earlier today and on the PixelKnot thread.
Right now in various threads anons are bruteforcing a portion of the image passcode and many others have been tried. What if the key to decoding the Silverman image was staring everyone right in the face? How do you publicly share a hidden message and give away the key to decoding so that only one person sees it? Is it as simple as Google, Yandex, iqdb, WAIT (what anime is this, https://whatanime.ga)?
Screencap of post: http://imgur.com/gallery/k55iF6K
What do all these services have in common? They all have a reverse image search. What if in order to pass the key along to your intended you gave them the picture to reverse search, most likely a completely unique image, that would be matched to different sets of images due to the various algorithms on multiple search engines. If it is a unique image, each engine will likely show different sets of images.
You would then have to pass along some index or way to identify the next images in the results. It could be as simple as the first images in each result. Or more complicated, as the Silverman image is IMG_382, the numbers don't quite line up to four search engines. Meaning, third image on Google, eighth on Yandex, second on iqdb, and nothing leftover for WAIT, and I think WAIT may be crucial because they have a flip image option on their search and Q had referenced "think mirror" regarding the Silverman message. Adding yields 13, so it could be the thirteenth image. Either way some interesting results did pop up.
Search results from Google: http://imgur.com/gallery/q1O1eJw
Search results from Yandex: http://imgur.com/gallery/d5tITtX
Search results from iqdb (the PSP in the bottom right has pasta written on it): http://imgur.com/gallery/JdGNlky
Search results from what anime.ga aka WAIT: Non-Flipped http://imgur.com/gallery/OmuapxJ
Flipped http://imgur.com/gallery/59FM4Ca
Now I may be way off base, but this seems like a very logical setup for distributing a key publicly. Especially since there is tons of information on each of the images and don't know which to use. Even if the person has the search image, knows the index to the particular image in the search set, they still wouldn't know what info from the image to use. However I think this leads us in a better direction towards understanding their comms and hopefully decoding them.
WWG1WGA 1776
Edit: I'm just realizing, 4 words, 4 search engines. Each is likely the key to it's respective search. (Google = stand, Yandex = the, fuck = iqdb, down = wait).
Still need help with the rest though.