Are there spatial ciphers/cryptanalysis techniques based on neighborhood spaces in a grid? More specially are there 5 orientation spaces with the values being north, south, east, west, neutral? Thanks for the help guys.
I know this sounds more like rigorous math, but just need a simple explanation or some direction, as in resources or keywords or links (springerlink, arxiv, etc.)? I have also posted on mathoverflow, so if this needs to be marked/deleted for being slightly off-tangent, that's understandable. Thanks again.