Latin squares; swap

In older indicator systems, folks used latin square “cards” to communicate the settings.

From at  web

Concerning latin/greek/magic/pan-magic squares,  genetic algorithms can be applied:

via magic site

Here is my video of a run. The mechanism is particularly interesting because of its “swap” operator, of course – so relevant to permutation group theory.

We can update the post a little, to reference something I half remember reading once before and thinking it excellent but only as instruction on how to think about analysis.

See http://www.scribd.com/doc/59517381/HiSea-A-Non-Binary-Toy-Cipher

Back at QMW, we get semi-latin discussions.

A nice backgrounder is also available in a wider context of core crypto:

From http://www.maths.qmul.ac.uk/~pjc/notes/crypt.pdf