the rifle position is suggesting which random key encryption table they will be using for the message to follow? Assuming 8 easily discernable positions (12 O'clock, 1:30, 3:00, 4:30, etc...) they could have 8 variations on which pre-defined encryption scheme to use... That's just one possibillity... I heard that pixel counts on images can be used for coordinates. A lot of information COULD be transmitted with one graphic file in a web page, depending on how much one wanted to convey. It's very disturbing from an intelligence gathering standpoint that so much can be hidden in plain sight.