The December 1944 Special Fish Report by Albert Small
Page 94 1/2
Tony Sale's
Codes and Ciphers
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CX/MSS
TOP SECRET Special Fish Report Page 94 1/2
This square is then crudely converged. The resultant pattern (or its inverse--
whichever is "slant," or if not "slant," whichever has most crosses in it)
usually gives what the original delta psi prime character first assumed
should have been. Sample square shown:
5. The corrected version of the original delta psi prime assumption
is now entered, all work corrected accordingly, and the Turingery process
carried forward as at Arlington, by carrying the delta X signs from the
children forward and backward to their "multiple" positions, "counting out"
wheel patterns as described at the bottom of page 81, etc.
Colossus breaking of key is also possible, and is similar to
Colossus wheel-breaking (only much faster.) The machine attack on parametric
equations (3) and (4), called "cribbing" and "key breaking on Colossus"
are next to be described.
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