8654Re: NSA Patent 6,947,978.
- Sep 29, 2005--- In email@example.com, "Jim Parker" <Jim@F...> wrote:
> <<< what is one important factor that has to be taken into accountto
> accurately measure network latency? >>>to
> There are several, but to name just a couple:
> Propagation (the time it takes for a packet to travel from one point
> another at the speed of light).etc.)
> The conduit used to transport the packet (optical, cable, wireless,
> would be a major consideration, as some would cause considerablymore
> latency (delay) than others.Accurate measurements of network latency has alot to do with clock
> And others.....
> What's your point?
skews from the device the latency is being measured from. Packet
propogation takes into account the clock skews from the machine that
the packet was sent from.
Note we are talking about precise readings, not just ping times, which
are measured in milliseconds, still pretty precise but not quite as
precise as nanosecond measurements. And this should be noted because
the accuracy of the geogrpahical location of the machine that the NSA
would be tracing would depend the most accurate measurement of network
Clock Skews have more to do with this, than what you would lead the
reader to believe. Which you are right, was the basis of Kohno's
The fact that Khono's paper was published in May of 2005 does not
indicate how new or old his work is, he has a PhD. now, his research
could very well predate the year of 2000 when the NSA applied for
their patent. It is not uncommon for some research projects to take
years to complete in college, especially ones that people work on for
All of this is not to say that you are wrong about anything, Jim. Nor
is this to say that Joanne is some great visionary. The point here
that is I am trying to make, and that seems interesting to me, is a
speculation of whether or not it is possible that Kohno could have
shared his ideas with the NSA, or if the NSA could have gotten their
idea from Kohno in some indirect way. or perhaps it is the other way
around??? Especially since one of the major areas of research that
Tadayoshi Kohno works in is cryptography, which is what the NSA is all
about. It would not be unheard of for a student in computer science to
work with the NSA in certain areas. Afterall; Tsutomu Shimomura
produced software for the NSA as a student at University of California
at San Diego. I personally find this interesting....
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