## The Special Fish Report## Albert W. Small (December 1944)## Page 102 |
Tony Sale's Codes and Ciphers |

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- CX/MSS

- TOP SECRET Special Fish Report Page 102

page 96 except that the P5twoback impulse would have been omitted entirely. Thus the

P tape would have been simply:

- Level 1 (DeltaP2) differenced at 93

- (etc.)

the original tape would have had to have been different. The mathematics

leading to the differencing of P and Z at small multiples of the X2

wheel only, would have been of no avail. X wheels would have to have been

- of P and Z

P tape then would have looked like:

- Level 1 (DeltaP1&5) differenced at 943

Level 2 (DeltaP4&5) differenced at 598

Level 3 (DeltaP3&5) differenced at 667

Level 4 (DeltaP2&5) differenced at 713

Level 5 Control . x . x .x . x

The same type of runs would have been made, and the same tests employed,

since probabilities of getting dots are the same. The above tape however

requires much longer texts because the differencing interval is so much

greater.

- Key obtained from Robinson cribbing may now be solved as

next to be described.

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