On Mar 10, 2005, at 10:44 PM, Anthony Atkielski wrote:
Kris Kennaway writes:
Isn't this a non-problem if you use ntpd?
Unfortunately, no, because the TCP stacks on most systems don't use the disciplined clock provided by NTP for the timestamps. Instead they use a clock based directly on the RTC, which reveals a characteristic skew that is unique to each machine.
If the stacks used the NTP-disciplined actual time of day, plus perhaps a randomizing factor to avoid revealing patterns, this technique would become useless.
Wouldn't the skew resolution necessary for this tracking technique become useless with temperature variations, humidity, etc. that can affect most systems over the course of the day/week/year?
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