[Cryptography] Best internet crypto clock
leichter at lrw.com
Tue Oct 21 14:40:33 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
> it's fairly precise, it's not exact, and over very widespread areas
> the exact frequency and interference patterns recovered from a video
> or audio record have been used to determine exactly when (and to some
> extent where) the record was made.
> 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.
That's a cool technique. Do you have any references?
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