Morse was easier since its encoded on paper and then transmitted in code, encoding real time voice communication is far more difficult and has really only been practical since the early 1990s and even then the theory was far better than the practical results.
For some reason mobile phone companies are far better at this sort of technology than the military, probably because a phone is working between only two points so only two units need to knew the decrypting tools, a military radio signal needs to be decrypted by every other set and anybody else who can listen in within a large geographical area.
Secure voice - Wikipedia, the free encyclopedia
The current British system is Bowman, which dates from 1989, came available around 2005 and, in the opinion of most people who use it, still doesnt work properly. I'm just a history geek, ask Bish, whos probably had experience with it.
Military Communications trivia.
During the Boer War British forces were aware that telephone conversations were being overheard by Boer sympathisers. Lord Roberts arranged for conversations to be conducted by officers conversing in Classical Greek.
Faced with a similar problem in 1940 while in conversation with French government officials discussing the French surrender, Winston Churchill employed Hindustani speaking Guards officers as intermediaries.
The Chindits in Burma while talking "on air" on open radio circuits found that Cockney Rhyming slang totally confused the listening Japanese. American and Australian pilots charged with air drops to the Chindits were given lessons in Rhyming Slang. (Fish and Chips= Nips.)
That was the subject of the film "Wind Talkers" with Navajo Indians communicating-a more organised system.Didn't US forces use native Americans for the same thing. Not sure if it was in the Pacific or Europe.
Military Communications trivia.
During the Boer War British forces were aware that telephone conversations were being overheard by Boer sympathisers. Lord Roberts arranged for conversations to be conducted by officers conversing in Classical Greek.
Faced with a similar problem in 1940 while in conversation with French government officials discussing the French surrender, Winston Churchill employed Hindustani speaking Guards officers as intermediaries.
The Chindits in Burma while talking "on air" on open radio circuits found that Cockney Rhyming slang totally confused the listening Japanese. American and Australian pilots charged with air drops to the Chindits were given lessons in Rhyming Slang. (Fish and Chips= Nips.)