VENONA project

The VENONA project was a long-running and highly secret collaboration between United States intelligence agencies and the United Kingdom's MI5 that involved the cryptanalysis of messages sent by several Soviet intelligence agencies. There were known to be at least 13 code words for this effort used by the US and UK. VENONA was the last code word for the project.

The break-in

The Soviet systems in general used a code to convert words and letters into numbers, to which an additive key (from one-time pads) were added, further disguising the content. Some brilliant cryptanalysis by American and British codebreakers revealed that some of the one-time pad material had incorrectly been reused by the Soviets (specifically, entire pages, although not complete books), which allowed decryption (sometimes only partial) of a small part of the traffic.

Related Topics:
Code - Key

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It was Arlington Hall's Lt. Richard Hallock, working on Soviet "Trade" traffic, who first discovered that the Soviets were re-using pages. Hallock and his colleagues (including Genevieve Feinstein, Cecil Phillips, Frank Lewis, Frank Wanat, and Lucille Campbell) went on to break into a significant amount of "Trade" traffic, recovering many one-time pad additive key tables in the process.

Related Topics:
Richard Hallock - Cecil Phillips

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A very young Meredith Gardner (of what would become the National Security Agency) then used this material to break in to what turned out to be NKVD (and later GRU) traffic, by reconstructing the code used to convert text to numbers. Samuel Chew and Cecil Phillips also made valuable contributions. On 20 December 1946, Gardner made the first break into the code, revealing the existence of Soviet espionage in the Manhattan Project. {{NamedRef|breakin|1}} Others worked in Washington in the State Department, Treasury, Office of Strategic Services, and even the White House. Very slowly, using assorted techniques ranging from traffic analysis to defector information, more of the messages were decrypted.

Related Topics:
Meredith Gardner - National Security Agency - NKVD - GRU - 20 December - 1946 - Manhattan Project - State Department - Treasury - Office of Strategic Services - White House

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Claims have been made that information from physical theft of code books (a partially burned one was recovered by the Finns) to bugging embassy rooms in which text was entered into encrypting devices (analyzing the keystrokes by listening to them being punched in), contributed to achieving as much plaintext as was recovered. These latter claims are less than fully supported in the open literature.

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One significant aid (mentioned by the NSA) in the early stages may have been work done in co-operation between the Japanese and Finnish cryptanalytic organizations; when the Americans broke into Japanese codes during WWII, they gained access to this information. There are also reports that copies of signals purloined from Soviet offices by the FBI were helpful in the cryptanalysis.

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There has been speculation that the reason for the key material duplication was the increase in work (including key pad generation) in the period after the German attack in June of 1941. Other suggestions have it that it was Guderian's tanks just outside Moscow in early December that year which forced Moscow Centre to make such a fundamental error.

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