[ExI] help please, from you creative types

Ryan Rawson ryanobjc at gmail.com
Wed Sep 22 20:30:30 UTC 2010

Send the image to a trusted 3rd party, eg: a notary who will sign that
they received it as such and such time.

In applied cryptography there are a number of crypto-oriented
protocols for proving things like this.


2010/9/22 spike <spike66 at att.net>:
> Today I ask for some suggestions from those of you who think outside the
> box.  For those who offer good suggestions, the standard reward is yours: my
> gratitude, respect and everlasting admiration, or at least until I forget,
> whichever comes first, restrictions apply etc.
> Assume I did a particular job at the ranch on a particular day, and I wanted
> to prove in court at some future date that this task was performed on that
> particular day.  Of course I could have an honest neighbor witness and sign
> a statement to that effect, but then she could be subpoenaed to testify in
> court etc, and that isn't good, and may not even be possible, if for
> instance she is old and sick.  So imagine I take digital photos with a time
> stamp.  The time could be set wrong on the camera, so just to make sure, I
> get that day's newspaper and hold it in the foreground, then keep the
> paper.  So that proves to the satisfaction of the court that the event could
> not have taken place earlier than the timestamp on the camera, but it
> doesn't conclusively prove the event could not have taken place later.  I
> could have gotten last week's paper, intentionally set the camera time a
> week behind, taken the pictures and claimed the events took place a week
> earlier than they really did.
> Question please, extro-thinkers: how do I use a digital camera to prove an
> event took place no later than stated?
> This isn't a murder case or anything, just a civil matter, so the standards
> of proof are such that a digital photo is usually more than sufficient.  One
> day resolution is plenty good for this application, but not one week.  But
> using the newspaper trick I can only bound the problem on one side.
> spike
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