Founding Fathers believed in strong encryption.
Founding fathers of America used strong, very strong encryption that was not broken untill 1942 with Alan Touring's computer at Blechly park.
"First invented by Thomas Jefferson in 1795, this cipher did not become well known and was independently invented by Commandant Etienne Bazeries, the conqueror of the Great Cipher, a century later. The system was used by the United States Army from 1923 until 1942 as the M-94. "
Imagine using encryption that would not be broken for over 100 years or past our death.
Even if it is encrypted, message traffic shows connections of criminals. Enough for law enforcement to figure out who might be a bad guy.
People use hard encryption now. The FBI put out a call for people who speak ebonics because the FBI does not. "Damn, the shizzel dog." (in English - "It is true my friend")
A new worry. What happens when a person tells the truth "I forgot the key" and they can not un-encrypt a message under court order? How many times do we forget passwords of systems we are using let alone a message encrypted years ago.
This is still a new area of law IMO.