[GreenKeys] Teletype on 4.004 Revisted

[NNN7DXB at aol.com]

Hi Jim:
 
Understand the concept of synchronous crypto transmissions. We had  that
too during our time using the KW-26s which ran continuously whether or  not
traffic was present. The only time there was a "break" in those  
transmissions
was when the KW-26s had to be reset or rekeyed for the next 24 hour
"crypto period", or if they "jumped set" which they sometimes did (and  
which
necessitated a "reset").
 
Listening to a KW-26 on RATT, it too sounded like just ordinary  teletype
traffic, except that no one could copy anything but garble (KW-26s  made
a real mess out of traffic for the Russians, LOL).
 
Dave
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In a message dated 11/24/2013 9:31:00 A.M. Pacific Standard Time,  
jhhaynes at earthlink.net writes:

My  understanding is that modern crypto equipment emits a continuous stream
of  random-looking bits and they keep it up regardless of whether there
is  traffic, so as to foil traffic analysis.

When the transmission starts  at precisely 5PM it may be running in
parallel with transmission on another  frequency used during the daytime,
so the receiver can switch frequencies  without a break in traffic.

jhhaynes at earthlink dot  net

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