Editing Ultra (cryptography) (section)

===Partial disclosures===
In 1967, Polish military historian [[Władysław Kozaczuk]] in his book ''Bitwa o tajemnice'' ("Battle for Secrets") first revealed Enigma had been broken by Polish cryptologists before World War II.

Also published in 1967, [[David Kahn (writer)|David Kahn]]'s comprehensive chronicle of the history of cryptography, ''[[The Codebreakers]]'', does not mention Bletchley Park, although it does make the claim that Soviet forces were reading Enigma  messages by 1942.{{sfn|Deutsch|1977|p=16}} He also described the 1944 capture of a naval Enigma machine from {{GS|U-505||2}} and gave the first published hint about the scale, mechanisation and operational importance of the Anglo-American Enigma-breaking operation:

{{Quote|The Allies now read U-boat operational traffic. For they had, more than a year before the theft, succeeded in solving the difficult U-boat systems, and – in one of the finest cryptanalytic achievements of the war – managed to read the intercepts on a current basis. For this, the cryptanalysts needed the help of a mass of machinery that filled two buildings.{{sfn|Kahn|1967|p=506}}}}

[[Ladislas Farago]]'s 1971 best-seller ''The Game of the Foxes'' gave an early garbled version of the myth of the purloined Enigma. According to Farago, it was thanks to a "Polish-Swedish ring [that] the British obtained a working model of the 'Enigma' machine, which the Germans used to encipher their top-secret messages."{{sfn|Farago|1974|p=664}} "It was to pick up one of these machines that Commander Denniston went clandestinely to a secluded Polish castle [!] on the eve of the war. Dilly Knox later solved its keying, exposing all Abwehr signals encoded by this system."{{sfn|Farago|1974|p=674}} "In 1941 [t]he brilliant cryptologist Dillwyn Knox, working at the Government Code & Cypher School at the Bletchley centre of British code-cracking, solved the keying of the Abwehr's Enigma machine."{{sfn|Farago|1974|p=359}}