system
Given the following post, respond as if you're commenting on Reddit:
human
What was the first commercial device to use strong encryption?

Was it the AT&T TSD 3600? And is that why the NSA was so panicky in implementing the clipper chip into this device? Before this device were all commercial telecommunications open to being wire tapped by law enforcement agencies?

Sorry for all the questions, just trying to understand.

Thanks in advance.
gpt
How do you define strong encryption?

The enigma machine used pretty damn strong encryption in the 1940's - although it was probably not what you would consider a "commercial" machine - even though 40000 were made.