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8654Re: NSA Patent 6,947,978.

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  • Ricky Gurley
    Sep 29, 2005
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      --- In infoguys-list@yahoogroups.com, "Jim Parker" <Jim@F...> wrote:
      > <<< what is one important factor that has to be taken into account
      to
      > accurately measure network latency? >>>
      >
      >
      > There are several, but to name just a couple:
      >
      > Propagation (the time it takes for a packet to travel from one point
      to
      > another at the speed of light).
      >
      > The conduit used to transport the packet (optical, cable, wireless,
      etc.)
      > would be a major consideration, as some would cause considerably
      more
      > latency (delay) than others.
      >
      > And others.....
      >
      > What's your point?

      Accurate measurements of network latency has alot to do with clock
      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
      latency possible.

      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
      paper.

      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
      their PhD.

      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....


      Rick
      >
      > Jim
      >
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