[Arny Krueger]

"John Byrns" wrote in message

In article ,
Chris Hornbeck wrote:

On Wed, 01 Aug 2007 03:51:18 GMT, John Byrns
wrote:


PCM was just coming into use; digital audio
was considered so secure that it didn't need to be
manipulated at all; raw transmissions were considered
secure.

When was that, I didn't know that there was ever a time
that raw PCM was considered secure?

1970. It was a simpler, but no less mean, time. Sadly.

It may have been a simpler time, but I can assure you
from personal experience that "raw PCM" was not
considered secure in 1970. That is not to say that there
may not have been some people using "raw PCM" when it
should have been encrypted.

In the late 1960s I served at a Hawk site south of Miami that used a digital
RF link to receive and share real time command and control information. My
recollection is that the link was enciphered. The enciphering box had the
only DIP TTL chips in the whole battery - the rest was tubes and discrete
semiconductors.