ricfwolff

;;
;; Implementation of John Nash's enciphering-deciphering machine described in
;; http://www.nsa.gov/public_info/_files/nash_letters/nash_letters1.pdf
;;

(use gauche.sequence)
(use gauche.generator)
(use srfi-43)

;; The 'key' of this machine is a configuration of Permuter-Reverser (P/R)