The Venona project was a counter-intelligence program initiated by the United States Army Signal Intelligence Service (a forerunner of the National Security Agency) that lasted from 1943 to 1980. The program attempted to decrypt messages sent by Soviet Union intelligence agencies, including its foreign intelligence service and military intelligence services. During the program's four decades, approximately 3,000 messages were at least partially decrypted and translated. The project produced some of the most important breakthroughs for western counter-intelligence in this period, including the discovery of the Cambridge spy ring and the exposure of Soviet espionage targeting the Manhattan Project. The project was one of the most sensitive secrets of United States intelligence. It remained secret for over a decade after it ended and was not officially declassified until 1995.
- Commencement 1.1
- Breakthrough 2.1
- Results 2.2
- Significance 2.3
Bearing of Venona on particular cases 3
- Julius and Ethel Rosenberg 3.1
- Klaus Fuchs 3.2
- Alger Hiss and Harry Dexter White 3.3
- Donald Maclean and Guy Burgess 3.4
- Soviet espionage in Australia 3.5
- Public disclosure 4
- Texas textbook controversy 5
- Critical views 6
- See also 7
- Notes 8
References and further reading 9
- Books 9.1
- Online sources 9.2
During the initial years of the Cold War, the Venona project was a source of information on Soviet intelligence-gathering activity that was directed at the Western military powers. Although unknown to the public, and even to Presidents Franklin D. Roosevelt and Harry S. Truman, these programs were of importance concerning crucial events of the early Cold War. These included the Julius and Ethel Rosenberg spying case and the defections of Donald Maclean and Guy Burgess to the Soviet Union.
Most decipherable messages were transmitted and intercepted between 1942 and 1945. Sometime in 1945, the existence of the Venona program was revealed to the Soviet Union by the NKVD agent and United States Army SIGINT analyst and cryptologist Bill Weisband. These messages were slowly and gradually decrypted beginning in 1946 and continuing (many times at a low-level of effort in the latter years) through 1980, when the Venona program was terminated, and the remaining amount of effort that was being spent on it was moved to more important projects.
To what extent the various individuals were involved with Soviet intelligence is a topic of dispute. While a number of academics and historians assert that most of the individuals mentioned in the Venona decrypts were most likely either clandestine assets and/or contacts of Soviet intelligence agents, others argue that many of those people probably had no malicious intentions and committed no crimes.
The Venona Project was initiated in 1943, under orders from the deputy Chief of Military Intelligence (G-2), Carter W. Clarke. Clarke distrusted Joseph Stalin, and feared that the Soviet Union would sign a separate peace with the Third Reich, allowing Germany to focus its military forces against Great Britain and the United States. Code-breakers of the US Army's Signal Intelligence Service (commonly called Arlington Hall) analyzed encrypted high-level Soviet diplomatic intelligence messages intercepted in large volumes during and immediately after World War II by American, British, and Australian listening posts.
This message traffic, which was encrypted with a one-time pad system, was stored and analyzed in relative secrecy by hundreds of cryptanalysts over a 40-year period starting in the early 1940s. Due to a serious blunder on the part of the Soviets, some of this traffic was vulnerable to cryptanalysis. The Soviet company that manufactured the one-time pads produced around 35,000 pages of duplicate key numbers, as a result of pressures brought about by the German advance on Moscow during World War II. The duplication—which undermines the security of a one-time system—was discovered and attempts to lessen its impact were made by sending the duplicates to widely-separated users. Despite this, the reuse was detected by cryptologists in the US.
The Soviet systems in general used a code to convert words and letters into numbers, to which additive keys (from one-time pads) were added, encrypting the content. When used correctly, one-time pad encryption is unbreakable. Cryptanalysis by American and British code-breakers 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.
Generating the one-time pads was a slow and labor-intensive process, and the outbreak of war with Germany in June 1941 caused a sudden increase in the need for coded messages. It is probable that the Soviet code generators started duplicating cipher pages in order to keep up with demand.
It was Arlington Hall's Lieutenant Richard Hallock, working on Soviet "Trade" traffic (so called because these messages dealt with Soviet trade issues), who first discovered that the Soviets were reusing pages. Hallock and his colleagues, amongst whom were 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.
A young Meredith Gardner then used this material to break into 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. Venona messages also indicated that Soviet spies 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.
Claims have been made that information from the physical recovery of code books (a partially burned one was obtained 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 recovering much of the plaintext. These latter claims are less than fully supported in the open literature.
One significant aid (mentioned by the NSA) in the early stages may have been work done in cooperation between the Federal Bureau of Investigation (FBI) were helpful in the cryptanalysis. The Finnish radio intelligence sold much of its material concerning Soviet codes to OSS in 1944 during Operation Stella Polaris, including the partially burned code book.
NSA reported that (according to the serial numbers of the Venona cables) thousands of cables were sent, but only a fraction were available to the cryptanalysts. Approximately 2,200 messages were decrypted and translated; about half for the 1943 GRU-Naval Washington to Moscow messages were broken, but none for any other year, although several thousand were sent between 1941 and 1945. The decryption rate of the NKVD cables was as follows:
- 1942 1.8%
- 1943 15.0%
- 1944 49.0%
- 1945 1.5%
Out of some hundreds of thousands of intercepted encrypted texts, it is claimed under 3,000 have been partially or wholly decrypted. All the duplicate one-time pad pages were produced in 1942, and almost all of them had been used by the end of 1945, with a few being used as late as 1948. After this, Soviet message traffic reverted to being completely unreadable.
The existence of Venona decryption became known to the Soviets within a few years of the first breaks. It is not clear whether the Soviets knew how much of the message traffic or which messages had been successfully decrypted. At least one Soviet penetration agent, British Secret Intelligence Service representative to the U.S. Kim Philby, was told about the project in 1949, as part of his job as liaison between British and U.S. intelligence. Since all of the duplicate one-time pad pages had been used by this time, the Soviets apparently did not make any changes to their cryptographic procedures after they learned of Venona. However, this information allowed them to alert those of their agents who might be at risk of exposure due to the decryption.
The decrypted messages gave important insights into Soviet behavior in the period during which duplicate one-time pads were used. With the first break into the code, Venona revealed the existence of Soviet espionage at Los Alamos National Laboratories. Identities soon emerged of American, Canadian, Australian, and British spies in service to the Soviet government, including Klaus Fuchs, Alan Nunn May, and Donald Maclean. Others worked in Washington in the State Department, the Treasury, Office of Strategic Services, and even the White House.
The decrypts show the U.S. and other nations were targeted in major espionage campaigns by the Soviet Union as early as 1942. Among those identified are Julius and Ethel Rosenberg; Alger Hiss; Harry Dexter White, the second-highest official in the Treasury Department; Lauchlin Currie, a personal aide to Franklin Roosevelt; and Maurice Halperin, a section head in the Office of Strategic Services.
The identification of individuals mentioned in Venona transcripts is sometimes problematic, since people with a "covert relationship" with Soviet intelligence are referenced by cryptonyms. Further complicating matters is the fact the same person sometimes had different cryptonyms at different times, and the same cryptonym was sometimes reused for different individuals. In some cases, notably Hiss, the matching of a Venona cryptonym to an individual is disputed. In many other cases, a Venona cryptonym has not yet been linked to any person. According to authors John Earl Haynes and Harvey Klehr, the Venona transcripts identify approximately 349 Americans whom they claim had a covert relationship with Soviet intelligence, though fewer than half of these have been matched to real-name identities. However, not every agent may have been communicating directly with Soviet intelligence. Each of those 349 persons may have had many others working for, and reporting only to, them.
The Office of Strategic Services, the predecessor to the CIA, housed at one time or another between fifteen and twenty Soviet spies. Duncan Lee, Donald Wheeler, Jane Foster Zlatowski, and Maurice Halperin passed information to Moscow. The War Production Board, the Board of Economic Warfare, the Office of the Coordinator of Inter-American Affairs and the Office of War Information, included at least half a dozen Soviet sources each among their employees. In the opinion of some, almost every American military and diplomatic agency of any importance was compromised to some extent by Soviet espionage.
Some scholars and journalists dispute the claims by Haynes, Klehr, and others concerning the precision of the matching of cryptonyms to actual persons. Also contested is the implication that all 349 persons identified had an intentional "covert relationship" with Soviet intelligence; it is argued, in some cases, the individual may have been an unwitting information source or a prospect for future recruitment by Soviet intelligence.
Bearing of Venona on particular cases
Venona has added information—some unequivocal, some ambiguous—to several espionage cases. Some known spies, including Theodore Hall, were neither prosecuted nor publicly implicated, because the Venona evidence against them was withheld.
The identity of Soviet source cryptonymed '19' remains unclear. According to British writer Nigel West, '19' was president of Czechoslovak government-in-exile Edvard Beneš. Military historian Eduard Mark and American authors Herbert Romerstein and Eric Breindel concluded it was Roosevelt's aide Harry Hopkins. According to American authors John Earl Haynes and Harvey Klehr, source code-named '19' could be someone from the British delegation to the Washington Conference in May 1943. Moreover, they argue no evidence of Hopkins as an agent has been found in other archives, and the partial message relating to "19" does not indicate if this source was a spy.
However, Vasily Mitrokhin was a KGB archivist who defected from the Soviet Union with copies of KGB files. He claimed Harry Hopkins was a secret Russian agent. Moreover, Oleg Gordievsky, a high-level KGB officer who also defected from the Soviet Union, reported that Iskhak Akhmerov, the KGB officer who controlled the clandestine Soviet agents in the U.S. during the war, had said Hopkins was “the most important of all Soviet wartime agents in the United States."
Julius and Ethel Rosenberg
Venona has added significant information to the case of Julius and Ethel Rosenberg, making it clear Julius was guilty of espionage, but also showing that Ethel was probably no more than an accomplice, if that. Venona and other recent information has shown, while the content of Julius' atomic espionage was not as vital as alleged at the time of his espionage activities, in other fields it was extensive. The information Rosenberg passed to the Soviets concerned the proximity fuze, design and production information on the Lockheed P-80 jet fighter, and thousands of classified reports from Emerson Radio. The Venona evidence indicates unidentified sources code-named "Quantum" and "Pers" who facilitated transfer of nuclear weapons technology to the Soviet Union from positions within the Manhattan Project. According to Alexander Vassiliev's notes from KGB archive, "Quantum" was Boris Podolsky and "Pers" was Russell W. McNutt, an engineer from the uranium processing plant in Oak Ridge.
Venona is also responsible for the exposure of the atomic spy Klaus Fuchs. The Venona documents released in 1950 disclose information about the clandestine activities of Klaus Fuchs under his code names of CHARLES and REST. During his time on the Manhattan Project, the NSA learned of his relations with the KGB. On April 10, 1945, the Moscow office sent a message to New York concerning Fuchs' contribution to the Soviet atomic bomb development. This letter stated that Fuchs “is of great value," and his reports “contain information received for the first time about the electromagnetic method of separation of the atomic bomb." 
Alger Hiss and Harry Dexter White
According to the Moynihan Commission on Government Secrecy, the complicity of both Alger Hiss and Harry Dexter White is conclusively proven by Venona, stating "The complicity of Alger Hiss of the State Department seems settled. As does that of Harry Dexter White of the Treasury Department." In his 1998 book, Senator Moynihan expressed certainty about Hiss's identification by Venona as a Soviet spy, writing "Hiss was indeed a Soviet agent and appears to have been regarded by Moscow as its most important."
Several current authors, researchers, and archivists consider the Venona evidence on Hiss to be inconclusive.
Donald Maclean and Guy Burgess
When Kim Philby learned of Venona in 1949, he obtained advance warning that his fellow Soviet spy Donald Maclean was in danger of being exposed. The FBI told Philby about an agent cryptonymed 'Homer', whose 1945 message to Moscow had been decoded. As it had been sent from New York and had its origins in the British Embassy in Washington, Philby, who would not have known Maclean's cryptonym, deduced the sender's identity. By early 1951, Philby knew U.S. intelligence would soon also conclude Maclean was the sender, and advised Moscow to recall Maclean. This led to Maclean and Guy Burgess' flight to Russia in May 1951.
Soviet espionage in Australia
In addition to British and American operatives, Australians collected Venona intercepts at a remote base in the Outback. The Soviets remained unaware of this base as late as 1950.
The founding of the
- Aldrich, Richard J. (2001). The Hidden Hand: Britain, America and Cold War Secret Intelligence. John Murray Pubs Ltd.
- Bamford, James (2002). Body of Secrets: Anatomy of the Ultra-Secret National Security Agency. Anchor Books.
- Benson, Robert Louis (1996). Venona: Soviet Espionage and the American Response 1939–1957. Aegean Park Press.
- Budiansky, Stephen (2002). Battle of Wits: The Complete Story of Codebreaking in World War II. Free Press.
- Haynes, John Earl and Klehr, Harvey (2000). Venona: Decoding Soviet Espionage in America. Yale University Press.
- Haynes, John Earl; Klehr, Harvey E.;
- Lamphere, Robert J.; Shachtman, Tom (1995). The FBI-KGB War: A Special Agent's Story. Mercer University Press.
- Schrecker, Ellen (1998). Many Are the Crimes : McCarthyism in America. Little, Brown.
- Schrecker, Ellen (2006). Cold War Triumphalism: The Misuse of History After the Fall of Communism. New Press.
- Romerstein, Herbert and Breindel, Eric (2000). The Venona Secrets: Exposing Soviet Espionage and America's Traitors. Regnery Publishing.
- Theoharis, Athan (2002). Chasing Spies: How the FBI Failed in Counterintelligence But Promoted the Politics of McCarthyism in the Cold War Years. Ivan R. Dee.
- Trahair, Richard C.S and Miller, Robert (2009). Encyclopedia of Cold War Espionage, Spies, and Secret Operations. Enigma Books.
- Warner, Michael (1996). Venona - Soviet Espionage & American Response. Aegean Park Press.
- West, Nigel (1999). Venona--The Greatest Secret of the Cold War. Harper Collins.
"NSA official Venona site". National Security Agency. Retrieved 2006-07-09.
- Venona PDFs, arranged by date (NSA)
- "Selected Venona Messages". Central Intelligence Agency. Retrieved 2007-11-08.
- "The American Response to Soviet Espionage". CIA. 1996. Retrieved 2007-11-08.
- "MI5 Releases to the National Archives". MI5. Retrieved 2006-07-09.
- Naranjo, Denis. "Venona Chronology 1939–1996". Retrieved 2006-07-09.
- "Red Files: Interview with Cecil Philips, US Signal Intelligence Service". PBS. Retrieved 2006-07-09.
- Benson, Robert L. "The Venona Story". National Security Agency. Archived from the original on 2006-06-14. Retrieved 2006-06-18.
- Fox, John F., Jr. (2005). "In the Enemy’s House: Venona and the Maturation of American Counterintelligence". FBI. Archived from the original on 2006-11-15. Retrieved 2006-11-17.
- Romerstein , Herbert and Breindel, Eric (2000). "The Venona Secrets"Preface to . Regnery Publishing. Retrieved 2006-11-17.
- "Venona Documents on the Internet Archive". Internet Archive.
- "SECRETS, LIES, AND ATOMIC SPIES", PBS Transcript, Airdate: February 5, 2002
References and further reading
- Benson, Robert L. (2001). The Venona Story (PDF). Fort George G. Meade, MD: National Security Agency, Center for Cryptologic History. p. 1.
- Benson 2001, p. 5
- Benson 2001, p. 7
- Benson 2001, p. 34
- Benson 2001, pp. 20–22. Benson gives a basic list of the relevant messages; other accounts include Haynes and Klehr, p. 304, and West, p. 197.
- "'Remembrances of Venona' by Mr. William P. Crowell", NSA. 11 July 1995.
- Andrew, Christopher (1996). For the President's Eyes Only: Secret Intelligence and the American Presidency from Washington to Bush. Harper Perennial.
- "How VENONA was Declassified", Robert L. Benson, Symposium of Cryptologic History; October 27, 2005.
- "Tangled Treason", Sam Tanenhaus, The New Republic, 1999.
- Navasky, Victor (July 16, 2001). "Cold War Ghosts". The Nation. Retrieved 2006-06-27.
- Tales from decrypts. The Nation, 28 October 1996, pp. 5–6.
- Schrecker, Ellen. """Comments on John Earl Haynes', "The Cold War Debate Continues: A Traditionalist View of Historical Writing on Domestic Communism and Anti-Communism. Retrieved 2006-06-27.
- Benson 2001
- "Haynes & Klehr ''New York Times'' 1999". Nytimes.com. Retrieved 2014-02-15.
- Yuri Modin, My Five Cambridge Friends, 1994, Ballantine Books, ISBN 0-374-21698-3, p. 194
- Cryptologic Almanac 50th Anniversary Series -- VENONA: An Overview (DOCID: 3575728). Released by NSA on 06-12-2009, FOIA Case # 52567.
- "Women in Cryptologic History - Genevieve Feinstein - NSA/CSS". Nsa.gov. 2009-01-15. Retrieved 2014-02-15.
- Francis Litterio. "Why Are One-Time Pads Perfectly Secure?". Archived from the original on 2008-05-16.
- West, Nigel (2000). Venona: the greatest secret of the Cold War. London: HarperCollins. pp. 3–10.
- Haynes, John Earl and Klehr, Harvey (2000). Venona: Decoding Soviet Espionage in America. Yale University Press. p. 55.
- Moynihan, Daniel Patrick (1998). Secrecy : The American Experience. Yale University Press. p. 54. "these intercepts provided... descriptions of the activities of precisely the same Soviet spies who were named by defecting Soviet agents Alexander Orlov, Walter Krivitsky, Whittaker Chambers, and Elizabeth Bentley."
- Commission on Protecting and Reducing Government Secrecy. "A Brief Account of the American Experience" (PDF). Report of the Commission on Protecting and Reducing Government Secrecy. VI; Appendix A. US Government Printing Office. pp. A–27. Retrieved 2006-06-26. "Thanks to successful espionage, the Russians tested their first atom bomb in August 1949, just four years after the first American test. As will be discussed, we had learned of the Los Alamos spies in December 1946—December 20, to be precise. The US Army Security Agency, in the person of Meredith Knox Gardner, a genius in his own right, had broken one of what it termed the Venona messages—the transmissions that Soviet agents in the United States sent to and received from Moscow."
- Commission on Protecting and Reducing Government Secrecy. "A Brief Account of the American Experience" (PDF). Report of the Commission on Protecting and Reducing Government Secrecy. VI; Appendix A. US Government Printing Office. pp. A–7. Retrieved 2006-06-26. "KGB cables indicated that the Office of Strategic Services (OSS) in World War II had been thoroughly infiltrated with Soviet agents."
- "Eavesdropping on Hell" (PDF). National Security Agency. Retrieved 2006-06-26. "Currie, known as PAZh (Page) and White, whose cover names were YuRIST (Jurist) and changed later to LAJER (Lawyer), had been Soviet agents since the 1930s. They had been identified as Soviet agents in Venona translations and by other agents turned witnesses or informants for the FBI and Justice Department. From the Venona translations, both were known to pass intelligence to their handlers, notably the Silvermaster network."
- Warner, Michael (2000). "The Office of Strategic Services: America's First Intelligence Agency; Chapter: X-2". Central Intelligence Agency Publications. Retrieved 2006-06-27.
- Moynihan, Daniel Patrick (1998). Secrecy : The American Experience. Yale University Press. p. 54.
- Haynes, John Earl and Klehr, Harvey (2000). Venona: Decoding Soviet Espionage in America. Yale University Press. p. 12.
- Warner, Michael (2000). "The Office of Strategic Services: America's First Intelligence Agency; Chapter: X-2". Central Intelligence Agency Publications. Archived from the original on 2007-05-10. Retrieved 2006-06-26.
- Peake, Hayden B. (Summer 2000). "The Venona Progeny". Naval War College Review LIII (3). Archived from the original on August 17, 2000. Retrieved 2006-06-26.
- Haynes, John Earl; Herman, Arthur (February 2000). "Joseph McCarthy: Reexamining the Life and Legacy of America's Most Hated Senator" (Speech). Venona Exchange. Washington: Haynes. Retrieved 4 July 2013.
- Nigel West, Venona, największa tajemnica zimnej wojny, Warszawa 2006, p.138.
- Eduard Mark. "Venona's Source 19 and the Trident Conference of May 1943: Diplomacy or Espionage?". Intelligence and National Security. London, Summer 1998, pp. 1–31
- Romerstein, Herbert and Breindel, Eric (2000). The Venona Secrets: Exposing Soviet Espionage and America's Traitors. Regnery Publishing. p. 214.
- Haynes, John Earl and Klehr, Harvey (1999). Venona: Decoding Soviet Espionage in America. Yale University Press. pp. 205–206.
- "H-Net Discussion Networks - VENONA, the KGB, and Harry Hopkins [Haynes/Klehr]". H-net.msu.edu. 1999-07-14. Retrieved 2014-02-15.
- "The Sword and the Shield: The Mitrokhin Archive and the Secret History of the KGB," by Vasily Mitrokhin and Christopher Andrew.
- "KGB: The Inside Story of Its Foreign Operations from Lenin to Gorbachev," by Oleg Gordievsky and Christopher Andrew.
- New York Times Book Review of "Venona - Decoding Soviet Espionage in America"
- Haynes, John Earl; Klehr, Harvey E.;
- Vassiliev-Notebooks-and-Venona-Index-Concordance.pdf, ed. 2013, pp: 325, 343
- , NSA: Venona Monographs, pp: 8,14, 18-20
- , NSA, ed. 2013, pp: 325, 343
- "Appendix A; SECRECY; A Brief Account of the American Experience" (PDF). From "Report Of The Commission On Protecting And Reducing Government Secrecy". United States Government Printing Office. 1997. pp. A–37. "The complicity of Alger Hiss of the State Department seems settled. As does that of Harry Dexter White of the Treasury Department."
- Linder, Douglas (2003). "The Venona Files and the Alger Hiss Case". Retrieved 2006-06-27.
- Moynihan, Daniel Patrick (1998). Secrecy: The American Experience. Yale University Press. pp. 145–147.
See, for example:
Lowenthal (Autumn 2000). "Venona and Alger Hiss" (PDF). Intelligence and National Security. p. 119. Retrieved 2006-09-13.,
- Yuri Modin, My Five Cambridge Friends, 1994, Ballantine, p. 190–199
- Yuri Modin, My Five Cambridge Friends, 1994, Ballantine, p. 191
- Andrew, Christopher. "The Defence of the Realm. The Authorised History of MI5", 2008. ISBN 978-0-14-102330-4, p.371
- Moynihan, Daniel Patrick (1998). Secrecy : The American Experience. Yale University Press. p. 15.
- Benson, Robert Louis. "Venona Historical Monograph #4: The KGB in San Francisco and Mexico City and the GRU in New York and Washington". National Security Agency Archives, Cryptological Museum. Retrieved 2006-06-18.
- "Historians speak out against proposed Texas textbook changes | National Council for the Social Studies". Socialstudies.org. 2010-03-18. Retrieved 2014-02-15.
- "Rehabilitating Joseph McCarthy?". TFN Insider. 2009-10-29. Retrieved 2014-02-15.
- West, Nigel (1999). Venona--The Greatest Secret of the Cold War. Harper Collins. p. 330.
- Schneir, Walter; Miriam Schneir (1999-07-05). "Cables coming in from the cold. (Review of Venona: Decoding Soviet Espionage in America, by John Earl Haynes and Harvey Klehr)". Nation 269 (1): 25–30.
- The memo is now available on line at "FBI Records on Venona". FBI Records: The Vault. Retrieved 2013-10-03.
- Schneir, Walter; Miriam Schneir (1999-07-05). "Cables coming in from the cold. (Review of Venona: Decoding Soviet Espionage in America, by John Earl Haynes and Harvey Klehr)". Nation 269 (1): 28.
- For Lowenthal's work on the Hiss case see the Alger Hiss Story website, hosted at NYU.
- Available at the NSA's Venona website.
- Lowenthal, John (2000). "Venona and Alger Hiss". Intelligence and National Security 15 (3): 98–130.
- The first response to Lowenthal was Mark, Eduard (2003). "Who was ‘Venona's’ ‘Ales’? cryptanalysis and the Hiss case". Intelligence and National Security 18 (3): 45–72.
- See Schindler, John R. (2005-10-27). "Hiss in VENONA: The Continuing Controversy". Archived from the original on 2013-06-03. (archived version).
- Schrecker, Ellen (1998). Many are the Crimes: McCarthyism in America. Little, Brown. pp. xvii–xviii.
- Schrecker, Ellen. """Comments on John Earl Haynes', "The Cold War Debate Continues: A Traditionalist View of Historical Writing on Domestic Communism and Anti-Communism. Retrieved 2006-06-27.
- History of Soviet and Russian espionage in the United States
- List of Americans in the Venona papers
- List of Soviet agents in the United States
- Elizabeth Bentley
Schrecker believes the documents established the guilt of many prominent figures, but is still critical of the views of scholars such as John Earl Haynes, arguing, "complexity, nuance, and a willingness to see the world in other than black and white seem alien to Haynes' view of history."
According to historian Ellen Schrecker, "Because they offer insights into the world of the secret police on both sides of the Iron Curtain, it is tempting to treat the FBI and Venona materials less critically than documents from more accessible sources. But there are too many gaps in the record to use these materials with complete confidence."
Victor Navasky, editor and publisher of The Nation, has also written several editorials highly critical of John Earl Haynes' and Harvey Klehr's interpretation of recent work on the subject of Soviet espionage. Navasky claims the Venona material is being used to “distort … our understanding of the cold war" and that the files are potential “time bombs of misinformation." Commenting on the list of 349 Americans identified by Venona, published in an appendix to Venona: Decoding Soviet Espionage in America, Navasky wrote, "The reader is left with the implication— unfair and unproven— that every name on the list was involved in espionage, and as a result, otherwise careful historians and mainstream journalists now routinely refer to Venona as proof that many hundreds of Americans were part of the red spy network." Navasky goes further in his defense of the listed people and has claimed a great deal of the so-called espionage that went on was nothing more than “exchanges of information among people of good will" and that “most of these exchanges were innocent and were within the law."
Many of the critiques of the Venona translations have been based on specific cases. The Schneirs' critique of the Venona documents was based on their decades of work on the case of Ethel and Julius Rosenberg. Another critique of the Venona translations came from the late Rutgers University law professor John Lowenthal, who as a law student worked as a volunteer for Alger Hiss's defense team, and later wrote extensively on the Hiss case. Lowenthal's critique focused on one message (Venona 1822 KGB Washington-Moscow 30 March 1945), in which the comments identified the covername 'Ales' as "probably Alger Hiss." Lowenthal raised a number of objections to this identification, rejecting it as "a conclusion psychologically motivated and politically correct but factually wrong." Lowenthal's article led to an extended debates on the 'Ales' message, and even prompted the NSA to declassify the original Russian text. Currently Venona 1822 is the only message for which the complete decrypted Russian text has been published.
However, a number of writers and scholars have taken a critical view of the translations. They question the accuracy of the translations and the identifications of covernames that the NSA translations give. Writers Walter and Miriam Schneir, in a lengthy 1999 review of one of the first book-length studies of the messages, object to what they see as the book’s overconfidence in the translations’ accuracy, noting that the undecrypted gaps in the texts can make interpretation difficult, and emphasizing the problem of identifying the individuals mentioned under covernames. To support their critique, they cite a declassified memorandum, written in 1956 by A. H. Belmont, who was assistant to FBI director J. Edgar Hoover at the time. In the memo, Belmont discusses the possibility of using the Venona translations in court to prosecute Soviet agents, and comes out strongly opposed to their use. His reasons include legal uncertainties about the admissibility of the translations as evidence, and the difficulties that prosecution would face in supporting the validity of the translations. Belmont highlights the uncertainties in the translation process, noting that the cryptographers have indicated that “almost anything included in a translation of one of these deciphered messages may in the future be radically revised." He also notes the complexities of identifying people with covernames, describing how the personal details mentioned for covername “Antenna" fit more than one person, and the investigative process required to finally connect “Antenna" to Julius Rosenberg. The Schneirs conclude that "A reader faced with Venona's incomplete, disjointed messages can easily arrive at a badly skewed impression."
The majority of historians are convinced of the historical value of the Venona material. Intelligence historian Nigel West believes that "Venona remain[s] an irrefutable resource, far more reliable than the mercurial recollections of KGB defectors and the dubious conclusions drawn by paranoid analysts mesmerized by Machiavellian plots."
 to suggest Venona shows Senator curricula Controversy arose in 2009 over the Texas State Board of Education's revision of their high school history class
Texas textbook controversy
The National Cryptologic Museum features an exhibit on the Venona project in its "Cold War/Information Age" gallery.
"A balanced history of this period is now beginning to appear; the Venona messages will surely supply a great cache of facts to bring the matter to some closure. But at the time, the American Government, much less the American public, was confronted with possibilities and charges, at once baffling and terrifying."
The dearth of reliable information available to the public—or even to the President and Congress—may have helped to polarize debates of the 1950s over the extent and danger of Soviet espionage in the United States. Anti-Communists suspected many spies remained at large, perhaps including some known to the government. Those who criticized the governmental and non-governmental efforts to root out and expose communists felt these efforts were an overreaction (in addition to other reservations about McCarthyism). Public access—or broader governmental access—to the Venona evidence would certainly have affected this debate, as it is affecting the retrospective debate among historians and others now. As the Moynihan Commission wrote in its final report:
One of the considerations in releasing Venona translations was the privacy interests of the individuals mentioned, referenced, or identified in the translations. Some names were not released because to do so would constitute an invasion of privacy. However, in at least one case, independent researchers identified one of the subjects whose name had been obscured by the NSA.
"[The] secrecy system has systematically denied American historians access to the records of American history. Of late we find ourselves relying on archives of the former Soviet Union in Moscow to resolve questions of what was going on in Washington at mid-century. [...] the Venona intercepts contained overwhelming proof of the activities of Soviet spy networks in America, complete with names, dates, places, and deeds."
Many inside the NSA had argued internally that the time had come to publicly release the details of the Venona project, but it was not until 1995 that the bipartisan Commission on Government Secrecy, with Senator Moynihan as chairman, released Venona project materials. Moynihan wrote:
Some of the earliest detailed public knowledge that Soviet code messages from World War II had been broken came with the release of Robert Lamphere's book, The FBI-KGB War, in 1986. Lamphere had been the FBI liaison to the code-breaking activity, had considerable knowledge of Venona and the counter-intelligence work that resulted from it. MI5 assistant director Peter Wright's 1987 memoir, Spycatcher, however, was the first detailed account of the Venona project, identifying it by name and making clear its long-term implications in post-war espionage.
For much of its history, knowledge of Venona was restricted even from the highest levels of government. Senior army officers, in consultation with the FBI and CIA, made the decision to restrict knowledge of Venona within the government (even the CIA was not made an active partner until 1952). Army Chief of Staff Omar Bradley, concerned about the White House's history of leaking sensitive information, decided to deny President Truman direct knowledge of the project. The president received the substance of the material only through FBI, Justice Department, and CIA reports on counterintelligence and intelligence matters. He was not told the material came from decoded Soviet ciphers. To some degree this secrecy was counter-productive; Truman was distrustful of FBI head J. Edgar Hoover and suspected the reports were exaggerated for political purposes.
Investigation revealed that Clayton formed an underground network within the CPA so that the party could continue to operate if it were banned.