## The Special Fish Report## Albert W. Small (December 1944)## Page 2 |
Tony Sale's Codes and Ciphers |

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CX/MSS TOP SECRET Special Fish Report Page 2

and that now existing at G.C. & C.S. We have all the elements of the story

-- in fact, many more elements than are used in the story -- and we lack

only the operational perspective to piece them together. It is a perspective

that we can hardly attain unless we ourselves do operations on an

"assembly line" basis.

- (Tony Sale: Notes written in pencil)

(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)

plain text D from cipher text Z. Major Tester must solve the latter,

obtaining plain text P from pseudo cipher text D.

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

equation (1) has taken the greatest amount of statistical science, and is of

great primary interest to Arlington Hall. Equation (2) has taken much

knowledge of language and is of great interest as an art.

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To give a better understanding of G.C. & C.S., it is necessary to retell much

that is already known to Arlington, and at the same time to assume a fair

knowledge of the Fish on the part of the reader.

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