The Special Fish Report

(Tony Sale: Notes written in pencil)


The formula* for the Fish machine is:

(Plain + periodic key + aperiodic key = cipher)

P + X + PSI' = Z

Z + X = PSI' + P

(cipher + periodic = pseudo plain)
(l) Z + X = D

(2) D + PSI' = P.
(pseudo + aperiodic = real plain)


G.C. & C.S. Fish sections are organized on the basis of these

Operations (1) and (2) are equally important, since no plain text

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