NSA
TUNNY MACHINE
DOCID: 3838670 TOP SECRET E>l~lAAThe "Tunny" Machine and Its SolutionBY BRIGADIER JOHN H. TILTMANThis article is substantially the same as a lecture given to the Crypto-M athematical Institute in October 1960. For that occasion an earUerlecture was completely rewritten so as Ix> place extra emphasill on thelessons to be learnt now from the original diagnostic research which leadto the solution of the "Tunny" machine in 1941 and 1942...
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