I think perhaps the satisfying answer you are looking for is: http://en.wikipedia.org/wiki/Kerckhoffs%27_principle http://en.wikipedia.org/wiki/Kerckhoffs%27_pr

I think perhaps the satisfying answer you are looking for is: http://en.wikipedia.org/wiki/Kerckhoffs%27_principle http://en.wikipedia.org/wiki/Kerckhoffs%27_principle