The Special Fish Report
Albert W. Small (December 1944)
Page 12
Tony Sale's
Codes and Ciphers
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CX/MSS
TOP SECRET Special Fish Report Page 12
set k3 07
4p/3x,1x2x
r 730 a 369 £ 13.5 st 382
k4
02 a 0382
11 a 0383
13 a 0389
15 a 0389
19 a 0386 (nothing)
20 a 0389
24 a 0384
11 a 0383
13 a 0389
15 a 0389
03 (4=5=/1=2)
r 1465 a 366 £ 16.5 st 406
k4 k5
01 01 a 0386
16 03 a 0423 3.6 sigma (this agrees for K5
16 20 a 0415 (with the C2 run
A new attack was next tried to set X3 properly, as below:
3x/1x2
r 566 a 283 £ 11.8 st 295
k3
07 a 0306
08 a 0296
13 a 0298
21 a 0326 - 3.8 £ ch (this contradicts
24 a 0302 (the C-4 run, and
05 a 0295 (is temporarily accepted
07 a 0305 - low
With this assumption for X3, the Colossus operator attempted to get more
data on X4 and X5 as shown:
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