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 Espionage  Codebreaking Quizzes, Trivia and Puzzles
 Espionage  Codebreaking Quizzes, Trivia

Espionage & Codebreaking Trivia

Espionage & Codebreaking Trivia Quizzes

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The name's quiz. World quiz. If you've had a love affair with the spy world, this is the right place for you.
31 quizzes and 325 trivia questions.
1.
  Secret Services of the World   popular trivia quiz  
Label Quiz
 10 Qns
Given the initials or names of the secret service organisations of various countries, can you locate them on the map provided? The names are those used at the time of writing, in 2023, or those which are most familiar to us, even if unofficial.
Easier, 10 Qns, rossian, Sep 29 23
Easier
rossian editor
Sep 29 23
445 plays
2.
The Spy Girl
  The Spy Girl   top quiz  
Photo Quiz
 10 Qns
How much do you know about these women of history who became spies?
Average, 10 Qns, Plodd, Dec 04 19
Average
Plodd
Dec 04 19
453 plays
3.
  Enigma and Bletchley Park Codebreakers   best quiz  
Multiple Choice
 10 Qns
During WWII the Germans used a machine named Enigma to encode their radio messages in millions of different ways (and the key changed with each message). The British assembled a code-breaking unit at Bletchley Park to try to decipher these messages.
Average, 10 Qns, root17, Jan 23 11
Average
root17 gold member
3607 plays
4.
Code
  Code   popular trivia quiz  
Photo Quiz
 10 Qns
Let us take a look at some codes and ciphers used by spies and those who want to keep a secret.
Average, 10 Qns, ClaudiaCat, Apr 01 21
Average
ClaudiaCat gold member
Apr 01 21
376 plays
5.
  WWII Codenames and Nicknames   best quiz  
Multiple Choice
 20 Qns
Most know certain WWII events like D-Day, Pearl Harbor and the Blitz, but do you know the code names for operations, espionage activities, weapons, etc.?
Tough, 20 Qns, TwinFlame, Mar 30 17
Tough
TwinFlame
4100 plays
6.
  Famous People Who Spied on the Side   top quiz  
Multiple Choice
 10 Qns
Each of these famous people was very successful in his/her career. Each was also very successful at something else...espionage. I'll give a brief description of each famous person and see if you can figure out who that person is.
Average, 10 Qns, nmerr, Jun 30 11
Average
nmerr gold member
740 plays
7.
  The Spying Game   popular trivia quiz  
Match Quiz
 10 Qns
Espionage has been described as the world's second oldest profession. Match the espionage organisations on the left with the countries with which they were associated.
Easier, 10 Qns, darksplash, Apr 04 22
Easier
darksplash
Apr 04 22
250 plays
8.
  Psst, Wanna Hear a Secret?   best quiz  
Multiple Choice
 10 Qns
Espionage dates as far back as man himself. Some spies have achieved fame and notoriety and some have been hailed as heroes
Tough, 10 Qns, StarStruck60, Apr 18 19
Tough
StarStruck60
Apr 18 19
869 plays
9.
  The Real 'Windtalkers'   best quiz  
Multiple Choice
 10 Qns
This quiz looks at the Native American Codetalkers that served with the US Marines during World War II. They were the subject of the film 'Windtalkers', released in 2002.
Average, 10 Qns, Plumbus, Aug 07 20
Average
Plumbus gold member
Aug 07 20
1157 plays
10.
  Code Breaking   best quiz  
Multiple Choice
 10 Qns
In the history of the world cryptography has played a major role in military, political, and espionage affairs. This quiz focus on some of the most "famous" cases of cryptography and code makers and breakers.
Average, 10 Qns, skatharaki, May 23 16
Average
skatharaki
370 plays
trivia question Quick Question
Who was the Army Warrant Officer convicted of selling secret signal intelligence to the Soviet Union from 1983 to 1988?

From Quiz "Americans Committing Espionage against America"




11.
  Americans Committing Espionage against America   great trivia quiz  
Multiple Choice
 10 Qns
This quiz is about Ten Americans convicted of espionage against the United States from World War II on.
Average, 10 Qns, PaysonAZ2011, Feb 12 14
Average
PaysonAZ2011
462 plays
12.
  Stirred Not Shaken   popular trivia quiz  
Multiple Choice
 10 Qns
Forget James Bond. We're going to track some real life spies who were occasionally stirred but never shaken.
Average, 10 Qns, 480154st, Apr 24 18
Average
480154st gold member
Apr 24 18
264 plays
13.
  Spies and Spying    
Multiple Choice
 10 Qns
Spies have been around since Alexander the Great. Here's some cloak and dagger trivia you might enjoy!
Average, 10 Qns, Pick61, Jun 10 22
Average
Pick61
Jun 10 22
811 plays
14.
  Code Breakers   great trivia quiz  
Multiple Choice
 10 Qns
The art of war has long involved the creative use of a variety of codes. Journey through the ages with this quiz and the codes of war.
Tough, 10 Qns, TemptressToo, Dec 15 13
Tough
TemptressToo
738 plays
15.
  Spies and Spy Rings in WWII   great trivia quiz  
Multiple Choice
 10 Qns
Spying is as old as warfare itself and has sometimes been referred to as the 'world's second oldest profession'. WWII could not have been won without covert operations. Enjoy!
Average, 10 Qns, beterave, Jun 14 21
Average
beterave
Jun 14 21
516 plays
16.
  Names of the Communist Secret Services   great trivia quiz  
Multiple Choice
 10 Qns
This is my 1st quiz. Enjoy (I hope!). All the questions ask you to find the name of a countries secret service or state police from the communist era.
Tough, 10 Qns, JASR, May 04 18
Tough
JASR
May 04 18
851 plays
17.
  Introduction to Cryptography and its History   popular trivia quiz  
Multiple Choice
 10 Qns
In some sense cryptography can be viewed as a battle. New technology allows new codes to be made, but also allows new methods of breaking codes. This quiz traces some of the history of these codes, from Caesar to today's modern algorithms.
Tough, 10 Qns, kevinatilusa, Dec 08 23
Tough
kevinatilusa
Dec 08 23
918 plays
18.
  Soviet Spies    
Multiple Choice
 15 Qns
15 multiple choice questions on espionage during the Soviet era.
Average, 15 Qns, ironikinit, Jun 10 22
Average
ironikinit
Jun 10 22
994 plays
19.
  We Spy    
Multiple Choice
 10 Qns
Can you identify these professional spies from history?
Average, 10 Qns, Helene61, Jun 10 22
Average
Helene61
Jun 10 22
578 plays
20.
  In From the Cold    
Match Quiz
 15 Qns
WWII Spy Organizations
This quiz is about WWII spies, British, American, German and even Japanese. Also included will be some places and names of operations. It's up to you to match them up with the correct organization. Don't step on your trench coat!
Tough, 15 Qns, ncterp, Aug 17 23
Tough
ncterp gold member
Aug 17 23
45 plays
21.
  Catch the Soviet Mole   popular trivia quiz  
Multiple Choice
 10 Qns
A quiz on the most infamous moles as listed by the International Spy Museum.
Tough, 10 Qns, trident, Apr 26 20
Tough
trident editor
Apr 26 20
566 plays
22.
  The British Intelligence Services    
Multiple Choice
 10 Qns
A ten-question quiz on the British secret and intelligence services.
Tough, 10 Qns, tlowen00r, Jun 04 19
Tough
tlowen00r
Jun 04 19
764 plays
23.
  U.S. Secret Service Code Names    
Multiple Choice
 10 Qns
You will be given a Secret Service code name; select the President, First Lady, or member of the Presidential family that is connected to that name.
Tough, 10 Qns, Arachnomancer, Aug 04 07
Tough
Arachnomancer
603 plays
24.
  WW II, Spying 123    
Multiple Choice
 10 Qns
Some random WWII spy questions.
Average, 10 Qns, patrick1971, Jan 17 22
Average
patrick1971
Jan 17 22
2262 plays
25.
  Can You Crack the Code?    
Multiple Choice
 10 Qns
In World War II, there were Navajo Code Talkers who were instrumental in the war. Test your knowledge about these heroes in this ten question quiz.
Difficult, 10 Qns, pennie1478, Aug 15 05
Difficult
pennie1478 gold member
1059 plays
26.
  WW2 Code Names    
Multiple Choice
 10 Qns
Codes for individuals, units, operations, etc.
Average, 10 Qns, cliffster69, Sep 30 21
Average
cliffster69
Sep 30 21
2420 plays
27.
  Espionage    
Multiple Choice
 10 Qns
This quiz tests your SpyQ, most of the questions are about intelligence agencies, a few are about spies.
Difficult, 10 Qns, riddhi, Aug 16 16
Difficult
riddhi
1403 plays
28.
  Decoding Military Operations    
Multiple Choice
 10 Qns
In war operations, movements, meetings are always encoded. Fancy your chances at some decoding? Good luck and as ever enjoy.
Difficult, 10 Qns, fiachra, Dec 29 07
Difficult
fiachra
819 plays
29.
  Spies And Spy Agencies    
Multiple Choice
 10 Qns
A little quiz about the espionage industry in the 20th Century.
Tough, 10 Qns, sportcon, Jan 28 16
Tough
sportcon
1807 plays
30.
  Alphabet Soup    
Multiple Choice
 10 Qns
Think you know your intelligence acronyms? Find out here.
Difficult, 10 Qns, Stillman, May 17 05
Difficult
Stillman
1333 plays
31.
  Codebreaking in WWII    
Multiple Choice
 5 Qns
I watched a PBS special on codebreaking in WWII and found it so interesting, I had to make a quiz!
Tough, 5 Qns, ladymacb29, Jan 17 15
Tough
ladymacb29 editor
1529 plays
Related Topics
  Military Matters [World] (447 quizzes)

  World War II [History] (587 quizzes)


Espionage & Codebreaking Trivia Questions

1. Who was the fourth member of the "Cambridge Spy Ring", who confessed in 1964, but wasn't publicly named until 1979?

From Quiz
Stirred Not Shaken

Answer: Anthony Blunt

The "Cambridge Spy Ring" consisted of Donald Maclean, Guy Burgess, Kim Philby and Blunt. All were educated at Cambridge University and all worked either for the Foreign Office or British Intelligence. They passed secrets to the Soviets for many years, probably from WWII up to the early 1950s and none of them was ever prosecuted for their crimes. Maclean and Burgess fled UK before they could be questioned in 1951 to a destination unknown, which was revealed as Soviet Union in 1956. Philby, while employed by MI6 and working as a journalist in Middle East, defected to Soviet Union in 1963 and Blunt confessed in 1954 in exchange for immunity from prosecution, Margaret Thatcher revealed his identity in 1979 and this ended Blunt's successful career as an art historian as well as seriously impacting his public life. He died three years later in London, aged 75.

2. One of the greatest generals of all time, Julius Caesar, formed his own cryptic method that has become known as "Caesar's Cipher". By doing what exactly?

From Quiz Code Breaking

Answer: Moving each letter of the alphabet a fixed number of spaces

One of the earliest known ciphers, "Caesar's Cipher" consists of replacing each letter with a different one the same number of places down the alphabet. e.g. A with D, B with E, C with F etc. Simple, isn't it?

3. This outrageous exotic dancer passed information to many of her German lovers and eventually was tried and found guilty as a double agent and executed.

From Quiz We Spy

Answer: Mata Hari

Mata Hari (1876-1917) was notorious as an exotic dancer and a prostitute. Her many lovers included military men, which led to her becoming a spy in WWI. Eventually she worked as a double agent. She was truly shocked upon hearing her guilty verdict. She was bold and insistent on her innocence right up to the end. At her death, she blew a kiss to the priest and her lawyer and faced the firing squad without a blindfold. Today, many believe she was innocent.

4. What couple was convicted of giving atomic secrets to the Soviet Union?

From Quiz Americans Committing Espionage against America

Answer: Julius and Ethel Rosenberg

Julius and Ethel were dedicated to passing top-secret information about the US atomic bomb program to the Soviets. Included in the ring were David Greenglass, Harry Gold, Morton Sobell, and the German scientist Klaus Fuchs. Julius was recruited by the Soviets as early as 1942, and passed information to them throughout World War II, concerning work at Los Alamos that he received from Greenglass. He is believed to have turned over classified documents to the Soviets regarding the fledgling atomic program, including sketches of an atomic bomb in 1945. The results of the information provided is believed to have advanced the Soviet nuclear program by years, and helped them achieve the atomic bomb much earlier than would have otherwise been the case. The result is that both were convicted under the Espionage Act of 1917, and sentenced to death. They were both executed by electrocution in 1953.

5. Perhaps World War I's most notorious spy was Mata Hari, executed by the French in October, 1917. In 1963, files were released which have caused many to reach a startling conclusion. What is it?

From Quiz Spies and Spying

Answer: She was most likely innocent of espionage

Mata Hari was a dancer who lived a somewhat scandalous life style. She likely wasn't really bright enough to be trusted as a spy, but her many liaisons with French officers made her suspect. Recent discoveries point out that the French Army was looking for excuses for their military failures. One way was to invent a spy ring that probably didn't really exist.

6. The world knows her as a successful chef. She wrote a book about the art of French cooking and had her own cooking show on television. She was also a spy long before she became a chef. Who is she?

From Quiz Famous People Who Spied on the Side

Answer: Julia Child

Julia Child joined the OSS, forerunner of the CIA, in 1942 after discovering that, at 6'2" tall, she was too tall for the Women's Army Corps. One of her earliest assignments was to cook up a shark repellent that would protect underwater explosives from being accidentally set off by curious sea creatures. Later she was sent to Ceylon (now Sri Lanka) and then to China where she worked as Chief of the OSS Registry. The CIA remains mum about what Julia did in that capacity. It was in Ceylon that she met her husband Paul Child, a fellow OSS officer. After they married, Julia quit her job but her husband continued to work for the government. After he was transferred to to the U.S. State Department in Paris, Julia took up cooking to occupy her time. The rest is culinary history.

7. What did British intelligence agents discover was the most effective method to turn captured German spies into double agents?

From Quiz Spies and Spy Rings in WWII

Answer: threatening to kill them

The British discovered that by threatening to kill captured German spies was the most effective method to turn them into double agents. This was done without torture and worked faster than persuasive argument.

8. Possibly the most famous female spy of all time, who is the lady who spied for the Germans during WW1?

From Quiz Psst, Wanna Hear a Secret?

Answer: Mata Hari

Born in Holland in 1876 as Margarethe Zelle, Mata Hari was an exotic dancer in Paris. She posed as a Princess from Java, and in this disguise was the mistress of several high ranking military officers, putting her in a position to hear much secret information. Because Holland stayed neutral during WW1 she was, as a Dutch National, able to move around without interference, even crossing borders with comparative freedom. She was once questioned by British Intelligence and claimed she was spying on the Germans for the French, which they accepted. In early 1917 an intercepted message stating that good intelligence was being received from an agent in France allowed the French Intelligence Services to identify her, and in February 1917 she was arrested. She was tried for espionage, found guilty and executed in September 1917. After her execution French Intelligence denied that she was in fact a double agent spying for them as well, and the truth of this will probably never be known. Ethel Rosenberg spied for the Russians. Belle Boyd was a Confederate spy. Violette Szabo was a member of British Intelligence who was executed by the Germans, and is the subject of the film "Carve Her Name With Pride".

9. From which Native American Nation were the codetalkers for the US Marines recruited?

From Quiz The Real 'Windtalkers'

Answer: Navajo

On a lesser scale, Commanche and Meskwaki speakers were employed by the US Army in Normandy and North Africa, but by far the biggest employer of Native American codetalkers was the US Marines who only recruited Navajo. The Navajo Nation straddles the borders of Utah, Arizona and New Mexico, covering an area of more than 27,000 square miles. In the 2000s it is home to more than 170,000 Navajo and has its own flag and government. As an example of one of the many ironies of 1940s cultural ideology, whilst the Navajo codetalkers were utilising their language to such good effect on the frontline of the Pacific War, Navajo schoolchildren were being punished for speaking their own language at reservation schools.

10. What was the operational name for the invasion of Normandy, France in 1944? (one word)

From Quiz WWII Codenames and Nicknames

Answer: Overlord

Overlord referred to the entire operation, and not just D-Day. Neptune was the codename for the actual beach landings. Before Overlord was settled on, the preliminary operation plans were known as Sledgehammer and Roundup.

11. Who had the Secret Service code name "Lace"?

From Quiz U.S. Secret Service Code Names

Answer: Jacqueline Kennedy Onassis

Jacqueline Kennedy Onassis was the wife of President John F. Kennedy. Her public image was one of style and grace. "Lace" was chosen for her to show her feminine and delicate demeanor.

12. What was the name of the Soviet Secret Service from 1954 onwards?

From Quiz Names of the Communist Secret Services

Answer: KGB

Cheka was a name of part of the original Soviet state security from 1917-1922. NKVD was one of the names of part of the Soviet state security from 1922-1954. KGV is short for King George V. The KGB (from 1954-91) was replaced by the Federal Security Service (FSB) in 1991, with the fall of communist power. Yuri Andropov led the KGB from 1967-1982. He became leader of the Soviet Union late in 1982 and appeared to want to drag the Soviet Union out from the stagnation of the Brezhnev era, but died in early 1984.

13. What was GCHQ previously known as?

From Quiz The British Intelligence Services

Answer: GCCS

GCHQ were previously known as Government Code and Cipher School. GC&CS were responsible for communications and decrypting messages. The most famous example of this was when the British decrypted the ENIGMA Machine messages in the Second World War.

14. How many Navajo Code Talkers attended boot camp in 1942?

From Quiz Can You Crack the Code?

Answer: 29

In May of 1942, there were twenty-nine Navajo Code Talkers that attended boot camp at Camp Elliot in San Diego, California.

15. John Walker sold over one million classified documents to the Soviets. What type of documents did he sell?

From Quiz Catch the Soviet Mole

Answer: Documents on naval movements and positions.

How he was caught: His ex-wife turned him in in 1985.

16. This organization was also known as the Committee for State Security.

From Quiz Alphabet Soup

Answer: KGB

KGB stands for "Komitet Gosudarstvenoy Bezoposnosti" (please excuse the awkward looking transliteration from the Cyrillic alphabet). This is translated from the Russian as "Committee for State Security".

17. In 1917 Lenin appointed Feliks Dzerzhinsky as Commisar for a new secret police. By what name do we know this "All-Russian Extraordinary Commission for Combating Counter-Revolution and Sabotage"?

From Quiz Soviet Spies

Answer: Cheka

In order to prevent a counter-revolution Dzerzhinsky adopted terror tactics, a position supported by Lenin, Trotsky, and Stalin. Thousands were executed. The Okhranka, by the way, was the tsarist secret police while the OGPU and KGB were later incarnations of the Soviet security apparatus. The Cheka was originally known as the Vecheka.

18. The Enigma code machine was initially developed to allow banks and railways to encode secret messages (although the name "Enigma" came later). Who invented this machine? (Hint: He died before World War II started.)

From Quiz Enigma and Bletchley Park Codebreakers

Answer: Arthur Scherbius

The Enigma code machine was first patented as a commercial encryption device in 1918 by a German inventor named Arthur Scherbius, but wasn't sold commercially until 1923. German banks and railways were among its first customers, but the German military was quick to see its potential and modified it for military use. They added a plugboard (similar to an old-fashioned telephone switchboard), which allowed an operator to plug pairs of letters together in an absolutely astronomical number of combinations. Karl Dönitz, Joseph Goebbels and Albert Speer were all significant German figures in World War II. Scherbius died in 1929. Historical note: Karl Dönitz was the top commander (Grand Admiral) of the German Kriegsmarine (Navy) during most of WWII. Just before Hitler committed suicide on 30 April 1945, Dönitz was named by Hitler as his successor as Head of State. Germany's surrender to the Allies on 7 May 1945 was signed by Alfred Jodl (acting as Dönitz's representative). Joseph Goebbels was the German Minister of Propaganda during WWII, and he had a huge influence in shaping German public opinion through speeches, staging spectacular public assemblies, and censoring the daily news. He and his wife Magda committed suicide on 1 May 1945, after first poisoning their six young children. Magda had said she didn't want her children growing up hearing their father branded a war criminal. Albert Speer served as Hitler's Minister of Armaments and War Production during WWII. He was convicted at the Nuremberg war crimes trials for his use of slave labor and spent 20 years in Spandau prison.

19. The Enigma used rotors in order to create and decode texts. How many rotors did the first Enigma machines use to do this?

From Quiz Codebreaking in WWII

Answer: 3

The first Enigma machines used 3 rotors. As the war progressed, some of the Germans went to a 4 rotor Enigma machine.

20. What group played a major part in the allied recon and invasion of Italy?

From Quiz WW II, Spying 123

Answer: The Mafia

The Italian Mafia provided German supply and troop strength information to allied forces prior to the invasion.

21. What did Rommel call the Devil's Garden ?

From Quiz WW2 Code Names

Answer: El-Alamein minefields

22. What was the name of the Shah of Iran's (Reza Shah Pahlavi, the Last Shah of Iran) intelligence agency?

From Quiz Espionage

Answer: SAVAK

One of the most ruthless secret services in the world during its time. The SAVAK failed to gauge and inform the Shah about the extent of the rebellion. He was also falsely assured that the Army completely supported him.

23. Downed U-2 pilot Frances Gary Powers was traded for what Soviet spy in 1962?

From Quiz Spies And Spy Agencies

Answer: Rudolph Ivonovich Abel

Abel operated in the U.S. from 1948 to 1961 under the name Emil R. Goldfus. Maki was Abel's assistant.

24. Sentenced to life imprisonment without parole in 1994, which American passed secrets to the Soviets for almost 10 years, causing the executions in the Soviet Union of Major General Dmitri Polyakov and Adolf Tolkachev among many others?

From Quiz Stirred Not Shaken

Answer: Aldrich Ames

Just two years into his spying career, Ames was suspected by co-workers of espionage due to the fact he was living well beyond his means, and although investigated by CIA and FBI, he passed two polygraph tests and was able to continue. By the time of his arrest, he had compromised over 100 CIA agents and caused the execution of at least 10 but he was living in a half million dollar house, driving a luxury Jaguar and had credit cards on which the minimum monthly payment exceeded his monthly salary of $5000.

25. It was in 1553 that the Italian cryptologist Giovani Bellaso invented one of the most enduring ciphers of all time. It remained unbroken for more than 300 years and is widely known by what name?

From Quiz Code Breaking

Answer: The Vigenere Cipher

The Cipher was formed in 1553 By Giovani Battista Bellaso, a well-known Italian cryptologist of his time. The name of the cipher was mistakenly attributed to Blaise de Vigenère 30 years after, when he created his own version of the code based on Bellaso's. The encryption method was so strong that it was only 300 years after, in 1854, that the famous mathematician Charles Babbage managed to break a variant of it.

26. Often called 'The Ace of Spies', this gentleman was the real life spy on whom James Bond was based.

From Quiz We Spy

Answer: Sidney Reilly

Sidney Reilly (1873-1925) is the model for James Bond and his real life exploits make even Bond look tame. His fame as an adventurer, spy and "ladies' man" were legendary especially after his unsuccessful attempt to overthrow the Bolshevik government in 1918.

27. Who was the Navy Warrant Officer that spied for the Soviet Union from 1968 to 1985?

From Quiz Americans Committing Espionage against America

Answer: John A. Walker, Jr.

John Walker started his spying career in 1968 by walking into the Soviet embassy in Washington D.C. and selling them a few classified codes he had access to. What followed was over a million U.S. Naval codes that allowed the USSR to know were all U.S. submarines were at all times. When it came time for Walker to retire he recruited his older brother Arthur, a close friend, Senior Chief Petty Officer Jerry Whitworth, his son Michael and even tried to get his daughter, but she was being discharged from the army to have a baby. John A. Walker, Jr. was finally arrested after his ex-wife turned him in. Walker was convicted of espionage and sentenced to life in prison.

28. Known for his brilliant military prowess during the Gallic Wars, Julius Caesar encoded his messages using a cipher that substitued the desired letter for a letter several positions away. What was this cipher known as?

From Quiz Code Breakers

Answer: Caesar cipher

The Caesar cipher was used by Julius Caesar during his military campaigns. The encoding and decoding was accomplished with the use of a device containing two dials. The innermost dial is rotated so that a letter can be encoded with a displaced letter from one to twenty-five spaces away. Decoding required knowing how many letters apart the coded letter was displaced from the correct letter. As such, it was a relatively simple code to break by any literate code breaker.

29. During the 1930s what centralized agency was charged with coordinating espionage activities for the United States?

From Quiz Spies and Spying

Answer: None

Spying activities had no overall organizationn charged with overseeing them. The OSS (Office of Strategic Services), the forerunner of the CIA, wasn't created until 1940.

30. What was the primary mission of ULTRA during WWII?

From Quiz Spies and Spy Rings in WWII

Answer: code breaking

The primary mission of ULTRA during WWII was the decryption of Axis radio communication or, to put it simply, code breaking.

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