The Venona project was a long-running secret collaboration of the United States and United Kingdom intelligence agencies involving cryptanalysis of messages sent by intelligence agencies of the Soviet Union, the majority of them during World War II. At least 13 codewords for the project were used by American and British intelligence agencies, including the National Security Agency (NSA); "Venona", a term with no known meaning, was the last. (In the decrypted documents issued from the NSA, "VENONA" is written in capitals, but lowercase is common in modern journalism.) It was not until 1995 that project materials were released by the U.S. government. Analysis supported some criminal spy cases, such as that against Julius Rosenberg for some of the charges, but cast doubt on the case against his wife Ethel Rosenberg.
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. Somebody who was working for the manufacturers of Soviet secret-communication materials had reused pages of some of the one-time pads in other pads, which were then used for other secret messages. This defeated the purpose of the one-time pad, which provides perfect security when each page is used exactly once and then disposed of. It is unclear as to why this mistake was made, or by whom.
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 (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.
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 Japanese and Finnish cryptanalysis organizations; when the Americans broke into Japanese codes during World War II, they gained access to this information. There are also reports that copies of signals purloined from Soviet offices by 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.
Inherent problems 
On 1 February 1956, the FBI's number-three man, Alan Belmont, an assistant to the director, distributed to top bureau officials the only known government analysis ever prepared on the reliability of the Venona decrypts with an eye to the possibility of using the decoded Venona material as prosecutorial evidence in court.
Belmont compared the Venona messages to teleprinters sent from FBI field offices to headquarters. The first messages to be partially decoded were full of gaps and were unintelligible. The army then turned to the FBI, believing "the Bureau by studying the messages and conducting investigations would be able to develop information which would assist the army cryptographers in reading additional unrecovered portions of the messages." Belmont concluded the decrypted material might not meet standards for evidence set by US law, and, even if it did, it suffered from deficiencies that could limit its usefulness as proof.
- In the first place, we do not know if the deciphered messages would be admitted into evidence.... The defense attorney would immediately move that the messages be excluded, based on the hearsay evidence rule. He would probably claim that.. .the contents of the messages were purely hearsay as it related to the defendants.
Belmont made it clear the successful use of the messages in a court of law to prove guilt would be difficult as well as violating hearsay evidence rules of evidence and the right of a defendant to face his accuser. The evidence had inherent weaknesses:
- The messages... are, for the most part, very fragmentary and full of gaps. Some parts of the messages can never be recovered again because during the actual intercept the complete message was not obtained. Other portions can be recovered only through the skill of the cryptographers and with the Bureau's assistance.
Belmont discussed the risks of making assumptions:
- It must be realized that the [deleted] cryptographers make certain assumptions as to meanings when deciphering these messages and thereafter the proper translations of Russian idioms can become a problem. It is for such reasons that [deleted] has indicated that almost anything included in a translation of one of these deciphered messages may in the future be radically revised.
Belmont discussed the problem of linking a code name with an actual name:
- Another very important factor to be considered when discussing the accuracy of these deciphered messages is the extensive use of cover names noted in this traffic. Once an individual was considered for recruitment as an agent by the Soviets, sufficient background data on him was sent to headquarters in Moscow. Thereafter, he was given a cover name and his true name was not mentioned again. This makes positive identifications most difficult since we seldom receive the initial message which states that agent "so and so" (true name) will henceforth be known as "____" (cover name). Also, cover names were changed rather frequently and the cover name "Henry" might apply to two different individuals, depending upon the date it was used.
Belmont dourly concluded:
- All of the above factors make difficult a correct reading of the messages and point up the tentative nature of many identifications.
The Antenna example 
A message dated 5 May 1944 carried information indicating an individual code-named 'Antenna' was 25 years of age, a member of Communist Party USA, lived in New York, matriculated at Cooper Union about 1940, worked in the U.S. Army Signal Corps at Ft. Monmouth, NJ, and his wife's name was Ethel.
- We made a tentative identification of 'Antenna' as Joseph Weichbrod since the background of Weichbrod corresponded with the information known about 'Antenna.' Weichbrod was about the right age, had a Communist background, lived in NYC, attended Cooper Union in 1939, worked at the Signal Corps, at Fort Monmouth, and his wife's name was Ethel. He was a good suspect for 'Antenna' until sometime later when we definitely established through investigation that 'Antenna' was Julius Rosenberg."
Usability in prosecutions 
The FBI's Alan Belmont considered that, although decryption might corroborate the testimony of Elizabeth Bentley and enable successful prosecution of such suspects as Judith Coplon and the Perlo and Silvermaster groups, a careful study of all factors compelled the conclusion it would not be in the best interests of prosecutors, defendants, and the United States to use Venona project information for prosecution.
As stated earlier, Belmont's memo offered a number of reasons why it was uncertain whether Venona project information should be revealed and admitted into evidence.
A major hurdle was a question of law. A defense attorney might immediately move to dismiss the evidence as hearsay, since neither the Soviet official who sent the message, nor the one who received it, was available to testify. The FBI reasoned decrypts probably could have been introduced, on an exception to the hearsay rule, based on the expert testimony of cryptographers.
In addition, according to Belmont, "the fragmentary nature of the messages and the extensive use of cover names therein make positive identification of the subjects difficult." Cover names were used not only for Soviet agents but other people as well. President Roosevelt, for example, was called "Kapitan" (Captain), and Los Alamos the "Reservation." Cryptonyms also were frequently changed, and might actually apply to two different people depending on the date it was used. Several subjects, notably Alger Hiss, Harry Dexter White, Maurice Halperin, and Lauchlin Currie, denied the accusations in open Congressional hearings based on information from sources other than Venona. Assumptions made by cryptographers, questionable interpretations, and translations placing reliance on expert testimony of cryptographers, and the entire case would be circumstantial.
Defense attorneys also would probably request to examine messages cryptographers were unsuccessful in breaking and not in evidence, on the belief such messages, if decrypted, could exonerate their clients. Before any messages could be used in court they would have to be declassified. Approval would have to come from several layers of bureaucracy as well British counterparts working on the same problem. The FBI determined this would lead to the exposure of government techniques and practices in the cryptography field to unauthorized persons, compromise the government's efforts in communications intelligence, and hinder other pending investigations.
NSA reported, according to the serial numbers of the Venona cables, thousands 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 not made public.
Identity of Soviet source cryptonymed "19" is unclear. According to British writer Nigel West it 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 codename "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 that 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 Ahkmerov, the KGB officer who controlled the clandestine Soviet agents in the U.S. during the war, had said that Hopkins was “the most important of all Soviet wartime agents in the United States.” In addition, Major George Racey Jordon stated he strongly suspected Hopkins was a spy based on activities he observed in his support role in the project known as "Lend-Lease."
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. Additionally, 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 codenamed "Quantum" and "Pers" who facilitated transfer of nuclear weapons technology to the Soviet Union from positions within the Manhattan Project.
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 expresses 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." However, several current authors, researchers, and archivists consider the Venona evidence on Hiss to be inconclusive or incorrect.
Donald Maclean and Guy Burgess 
When Kim Philby learned of Venona in 1949, he obtained advance warning that his fellow Soviet spies Donald Maclean and Guy Burgess were 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 Maclean be recalled.[clarification needed] This led to Maclean and Guy Burgess' flight to Russia in May 1951.
Soviet espionage in Australia 
In addition to the British and Americans, Venona intercepts were collected by the Australians at a remote base in the Outback. However, the Russians were not aware of this base even as late as 1950. The founding of the Australian Security Intelligence Organisation by Labor Prime Minister Ben Chifley was considered highly controversial within Chifley's own party. Until then, the left-leaning Australian Labor Party had been hostile to domestic intelligence agencies on civil liberties grounds, and a Labor government actually founding one was a surprising about face. It was the revelation of Venona material to Chifley revealing evidence of Soviet agents operating in Australia that brought this about. As well as Australian diplomat suspects abroad, Venona had revealed Wally Clayton (cryptonym KLOD), a leading official within the Communist Party of Australia, was the chief organiser of Soviet intelligence gathering in Australia. Investigation revealed he was forming an underground network within the CPA so the party could continue to operate if it was banned.
Public disclosure 
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.
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.
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:
"[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."
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 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:
"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 National Cryptologic Museum features an exhibit on the Venona project in its "Cold War/Information Age" gallery.
Texas textbook controversy 
Controversy arose in 2009 over the Texas State Board of Education's revision of their high school history class curricula to suggest Venona shows Senator Joseph McCarthy to have been justified in his zeal in exposing those who he believed to be Soviet spies or communist sympathizers.  Critics pointed out that most of the people and organizations identified by McCarthy were not mentioned in the Venona content, and the sources for his accusations are largely still unknown.
Critical views 
The relevance, accuracy, and even authenticity of Venona decrypts have been questioned. Critics claim the material is unverifiable, with some, such as left-wing activist William Kunstler, going so far as to claim NSA had forged Venona material in its entirety in order to discredit the Communist Party of the United States of America and its members. Research in Soviet Archives has added to the corroboration of some Venona material, including the identities of many codenamed individuals.
Some remain skeptical of both the substance and the prevailing interpretations made since the release of the Venona material. Victor Navasky, editor and publisher of The Nation, has 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.”
According to 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."
Schrecker agrees the documents have genuinely established the guilt of many prominent figures, but is still critical of the hardline interpretation by scholars such as Murno Gladst, arguing, "complexity, nuance, and a willingness to see the world in other than black and white seem alien to Haynes' view of history."
Writing about Alger Hiss, lawyer John Lowenthal criticized the accuracy and methodology of the Venona analysts, charging they employed false premises and flawed comparative logic to reach the desired conclusion his client was the spy "Ales." Lowenthal states this conclusion was psychologically and politically motivated but factually wrong.
Nigel West, on the other hand, expressed confidence in the decrypts: "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."
See also 
- Espionage Act of 1917
- 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
- Taman Shud Case
- 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, Robert L. "The Venona Story". National Security Agency. Archived from the original on 2006-06-14. Retrieved 2006-06-18.
- Haynes & Klehr New York Times 1999
- Yuri Modin, My Five Cambridge Friends, 1994, Ballantine Books, ISBN 0-374-21698-3, p. 194
- Why Are One-Time Pads Perfectly Secure?
- Daniel Patrick Moynihan (1997). "Report of the Commission On Protecting And Reducing Government Secrecy; Appendix A: The Experience of The Bomb". United States Government Printing Office. Retrieved 2006-06-18.
- Schneir, Walter and Miriam (1995-08-21). "The Schneirs on the Venona Papers". The Albert Hiss Story. Boston, New York: Harvard, NYU.
- Schneir, Walter; Schneir, Miriam (Aug 1995). "The Venona Papers". The Nation (Washington).
- "FBI Office Memorandum; A. H. Belmont to L. V. Boardman". February 1956. Retrieved 2006-06-27.
- Haynes, John Earl and Klehr, Harvey (2000). Venona: Decoding Soviet Espionage in America. Yale University Press. p. 55. ISBN 0-300-08462-5.
- Moynihan, Daniel Patrick (1998). Secrecy : The American Experience. Yale University Press. p. 54. ISBN 0-300-08079-4. "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."
- Benson, Robert L. "The Venona Story". National Security Agency. Archived from the original on 2006-06-14. Retrieved 2006-06-26.
- "Eavesdropping on Hell". 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. ISBN 0-300-08079-4.
- Haynes, John Earl and Klehr, Harvey (2000). Venona: Decoding Soviet Espionage in America. Yale University Press. p. 12. ISBN 0-300-08462-5.
- Warner, Michael (2000). "The Office of Strategic Services: America's First Intelligence Agency; Chapter: X-2". Central Intelligence Agency Publications. 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.
- 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. ISBN 0-89526-275-4.
- Haynes, John Earl and Klehr, Harvey (1999). Venona: Decoding Soviet Espionage in America. Yale University Press. pp. 205–206. ISBN 0-300-07771-8.
- "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.
- From Major Jordan's Diaries by George Racey Jordon and Richard L. Stokes.
- "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. ISBN 0-300-08079-4.
- See, for example:
Lowenthal (Autumn 2000). "Venona and Alger Hiss" (PDF). Intelligence and National Security. p. 119. Retrieved 2006-09-13.,
Navasky, Victor (July 16, 2001). "Cold War Ghosts". The Nation. Retrieved September 22, 2011.,
Theoharis, Athan (2002). Chasing Spies: How the FBI Failed in Counter-Intelligence But Promoted the Politics of McCarthyism in the Cold War Years. Ivan R. Dee. ISBN 1-56663-420-2.
- "Venona and the Russian Files". The Hiss Case in Story. Harvard, NYU. 2010. Retrieved 2010-07-28.
- 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. ISBN 0-300-08079-4.
- 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.
- William Kunstler (October 16, 1995). "Letter to the Editor". The Nation.
- Haynes, John Earl and Klehr, Harvey (2003). In Denial: Historians, Communism, and Espionage. Encounter Books. p. 101. ISBN 1-893554-72-4.
- Schrecker, Ellen (1998). Many are the Crimes: McCarthyism in America. Little, Brown. pp. xvii–xviii. ISBN 0-316-77470-7.
- 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.
- Lowenthal, John. "Venona and Alger Hiss".
- West, Nigel (1999). Venona--The Greatest Secret of the Cold War. Harper Collins. p. 330. ISBN 0-00-653071-0.
References and further reading 
- Aldrich, Richard J. (2001). The Hidden Hand: Britain, America and Cold War Secret Intelligence. John Murray Pubs Ltd. ISBN 0-7195-5426-8.
- Bamford, James (2002). Body of Secrets: Anatomy of the Ultra-Secret National Security Agency. Anchor Books. ISBN 0-385-49908-6.
- Benson, Robert Louis (1996). Venona: Soviet Espionage and the American Response 1939–1957. Aegean Park Press. ISBN 0-89412-265-7.
- Budiansky, Stephen (2002). Battle of Wits: The Complete Story of Codebreaking in World War II. Free Press. ISBN 0-7432-1734-9.
- Haynes, John Earl and Klehr, Harvey (2000). Venona: Decoding Soviet Espionage in America. Yale University Press. ISBN 0-300-08462-5.
- Lamphere, Robert J.; Shachtman, Tom (1995). The FBI-KGB War: A Special Agent's Story. Mercer University Press. ISBN 0-86554-477-8.
- Schrecker, Ellen (1998). Many Are the Crimes : McCarthyism in America. Little, Brown. ISBN 0-316-77470-7.
- Schrecker, Ellen (2006). Cold War Triumphalism: The Misuse of History After the Fall of Communism. New Press. ISBN 1-59558-083-2.
- Romerstein, Herbert and Breindel, Eric (2000). The Venona Secrets: Exposing Soviet Espionage and America's Traitors. Regnery Publishing. ISBN 0-89526-275-4.
- Trahair, Richard C.S and Miller, Robert (2009). Encyclopedia of Cold War Espionage, Spies, and Secret Operations. Enigma Books. ISBN 978-1-929631-75-9.
- Warner, Michael (1996). Venona - Soviet Espionage & American Response. Aegean Park Press. ISBN 0-89412-265-7.
- West, Nigel (1999). Venona--The Greatest Secret of the Cold War. Harper Collins. ISBN 0-00-653071-0.
- Wright, Peter; Paul Greengrass (1987). Spycatcher: The Candid Autobiography of a Senior Intelligence Officer. Viking. ISBN 0-670-82055-5.
Online sources 
- "NSA official Venona site". National Security Agency. Retrieved 2006-07-09.
- "Selected Venona Messages". Central Intelligence Agency. Retrieved 2007-11-08.
- "The American Response to Soviet Espionage". CIA. 1996. Retrieved 2007-11-08.
- Daniel Patrick Moynihan, Chairman (1997). "Report of the Commission On Protecting And Reducing Government Secrecy". United States Government Printing Office. Retrieved 2006-06-18.
- "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). "Preface to The Venona Secrets". Regnery Publishing. Retrieved 2006-11-17.