## The Special Fish Report## Albert W. Small (December 1944)## Page 5 |
Tony Sale's Codes and Ciphers |

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- CX/MSS

- TOP SECRET Special Fish Report -5

Delta-D text will not be random, being the sum of Delta-PSI'(with definite

characteristics)

and Delta-P (with definite characteristics).

- Characteristics of Delta-D

to 3,200 letters length:

/ ..... 128 R .x.x. 92 A xx... 96 D x..x. 89

9 ..x.. 110 C .xxx. 90 U xxx.. 124 F x.xx. 100

H ..x.x 102 V .xxxx 94 Q xxx.x 101 X x.xxx 87

T ....x 99 G .x.xx 100 W xx..X 89 B x..xx 82

O ...xx 104 L .x..x 92 5 xx.xx 143 Z x...x 89

M ..xxx 100 P .xx.x 96 8 xxxxx 112 Y x.x.x 97

N ..xx. 100 I .xx.. 96 K xxxx. 89 S x.x.. 104

3 ...x. 113 4 .x... 90 J xx.x. 103 E x.... 89

- Total 3,200

successful prosecution of the Fish problem, that practically every man,

every Wren, in the Newmanry and in the Testery, knows them by heart, together

with the variations to be expected on the different circuits and among the

different correspondents. The solution of equation (1) is not considered

complete unless the results match the expected Delta-D characteristics; and

Maj. Tester's section utilises these to the fullest in the art of converting

Delta-D into plain text.

- From the above table of deltaD characteristics, the following

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