[Cryptography] Best internet crypto clock

Jonathan Thornburg jthorn at astro.indiana.edu
Tue Oct 21 17:48:26 EDT 2014

On Oct 21, 2014, at 1:02 PM, Bear <bear at sonic.net> wrote:
> IIRC a lot has been done to verify video and audio as having come 
> from a certain moment in time or general location based on recovering
> the precise 'drift' of the omnipresent 60-cycle (or 50-cycle if 
> you're Australian) hum of the surrounding electrical system.
[[...]]  While 
> Relevant law enforcement and Intel agencies are, yes, known to monitor 
> and record the variances specifically for purposes of dating recordings
> that later may become evidence. 

On Tue, Oct 21, 2014 at 02:40:33PM -0400, Jerry Leichter wrote:
> That's a cool technique.  Do you have any references?

describes the technique, and says that the UK police have recorded
this since 2005.

-- Jonathan Thornburg <jthorn at astro.indiana.edu>
   Dept of Astronomy & IUCSS, Indiana University, Bloomington, Indiana, USA
   "There was of course no way of knowing whether you were being watched
    at any given moment.  How often, or on what system, the Thought Police
    plugged in on any individual wire was guesswork.  It was even conceivable
    that they watched everybody all the time."  -- George Orwell, "1984"

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