You forwarded me a message about a cryptosystem called Pontifex. Was this invented by a friend of yours? In its general outlines (viz, an n-element permutation that is used to generate a keystream, and that slowly evolves) it is similar to a commercial system called RC4, which enjoys a complicated reputation among Secret Admirers—it seems secure, and has not been broken, but it makes us nervous because it is basically a single-rotor system, albeit a rotor that evolves. Pontifex evolves in a much more complicated & asymmetrical way than RC4 and so might be more secure.