When was encrypted voice over radio first used?
score:5
I'm not sure if this is what you are looking for, but the A-3 Scrambler system was developed in 1939 by Bell Labs. It allowed supposedly secure communications between Roosevelt and Churchill as the Second World War broke out.
In reality the scrambler was very insecure and rather easily broken by the Germans. So between 1942-3 Bell Labs developed as a replacement the SIGSALY, which was much more technically sophisticated. Terminals of the SIGSALY system was installed around the world in Allied countries and was never broken.
The approaching war stimulated the investigation of true voice security. The BTL staff soon discovered that there were about eighty patents issued on the general topic, but analysis indicated that all of the methods were really unsatisfactory ... BTL proceeded on its own to develop this much-needed capability and was soon able to demonstrate it to the satisfaction of the Army. A U. S. Army contract was awarded in 1942 for the production of the first two systems. This system eventually came to be called SIGSALY and was first deployed in 1943.
- Boone, J. V. and R. R. Peterson, The Start of the Digital Revolution: SIGSALY Secure Digital Voice Communications in World War II, Center for Cryptologic History, National Security Agency, 2000.
The SIGSALY is held to be "the first realization of enciphered telephony" in a 1983 IEEE review.
More post
- 📝 Why is the flag of Prague yellow and red?
- 📝 Is there any evidence Chairman Mao restricted or confiscated guns?
- 📝 What is the citation-system for the Linear B tablets?
- 📝 How old is the practice of a woman accompanying another woman to the ladies restroom?
- 📝 How to travel from Koblenz (Germany) to Paris (France) in May 1805?
- 📝 How to make sense of Civil War regiment reports?
- 📝 Which is more correct, Carlos I or Carlos V?
- 📝 Is there a relationship between Portugal and Spain being able to discover the New World and the Moor occupation?
- 📝 Was there a Princess of Wales between 1727 and 1736?
- 📝 Were high wages the root cause of the industrial revolution?
- 📝 Why did Pakistan choose Islamabad as its capital?
- 📝 Codes:Hardest Code Ever
- 📝 Would a leader in a monarchy be able to hand their reign over to someone else?
- 📝 Where Can I Find Copies of the Richmond Enquirer?
- 📝 What was the median price for a slave child in the Augustan Rome?
- 📝 Are there any examples of two medieval kingdoms trying to unify but eventually failing to do so?
- 📝 When and why did the Democrats become the more liberal of the two main parties in the USA?
- 📝 Did humans live more densely in the past, and if so, how much denser?
- 📝 What murals and decor might have been present in the earliest Sumerian temples?
- 📝 Occupation of Iran in World War 2
- 📝 How did Diego Gutiérrez know the boundaries (shape of the Americas) when he drew the 1562 Map of America
- 📝 Why was Hannah Ocuish believed to have been mentally disabled?
- 📝 How did Lincoln's views change up to the Lincoln-Douglas Debates?
- 📝 Did British soldiers in WWI on the Western Front get paid in foreign currency?
- 📝 What happened to Israel when Persia attacked Egypt?
- 📝 Is the enforcement of Hijab wearing for Muslim women a recent occurrence?
- 📝 During World War I, why were church bells stopped until the war was over?
- 📝 Why was there a "workers' militia" in Eastern Europe but not in the USSR?
- 📝 Eastern Europe during middle ages, a world view
- 📝 Which factors led to the different casualty ratio betwen British and German forces during the Battle of Normandy?
Source: stackoverflow.com
Search Posts
Related post
- 📝 When was encrypted voice over radio first used?
- 📝 When was "diablo" first used to refer to the Devil?
- 📝 When was the testudo / tortoise formation first used by the Romans?
- 📝 When was King John of England given the name 'Dollheart', and who first used it?
- 📝 When the term "president" was used the first time?
- 📝 When was natural gas first used for cooking food?
- 📝 When was the White Feather first used as a symbol of cowardice?
- 📝 When was the first full length book sent over telegraph?
- 📝 When was glass first used to protect art?
- 📝 When was the term "Dravida" first used and what is the context with which it was presented?
- 📝 When was the first time that concrete was used in Indian Subcontinent?
- 📝 When was the term for WW2 first used and was it more popular in, say, US before Europe?
- 📝 What / When was the first use of concentration camps in history?
- 📝 When was the American War of Independence first called a 'Revolution'?
- 📝 When was the concept of "weekly day off" first introduced in Indian Subcontinent?
- 📝 When was the first electrical intra-battlefield communication?
- 📝 When was the first time Rome was mentioned in outside records (and specifically, in Greek ones)?
- 📝 When was the tactic of chaining ships together last used in a major naval battle?
- 📝 When and where was the first time moveable bridge?
- 📝 Why Europe became more developed although metal was first discovered and used in Asia/Africa?
- 📝 When was the concept of the "border wall" between the United States and Mexico first proposed?
- 📝 When was the first usage of the slogan "Wer hat uns verraten..."?
- 📝 When was grass seed first imported specifically for aesthetic reasons?
- 📝 When was the first intentional ricochet fired from a naval artillery?
- 📝 When and where was rape first criminalised independently from adultery?
- 📝 When was the first known international call between two heads of state or government?
- 📝 When was it first noticed that airplane passengers really seemed to like tomato juice?
- 📝 When did people first try to limit which weapons could be used in war?
- 📝 When was the first recorded example of a race competition in human history?
- 📝 When and where was the first naval gunnery school/college established?