On Tue, 31 Dec 2002, Thomas Shaddack wrote:
> Is there a way to RELIABLY find the mail was opened?
There are a variety of plastics and such that will change color and
break-down; the new time-limited DVD's that become unplayable after
some short period of days after opening the air tight container.
You could in effect put an air tight envelope around whatever you wanted
to protect, with a slice of this stuff in there as well. If it's opened
then when you get it...this of course assumes that the MITM attack
doesn't have access or knowledge of the trick. Would work a handfull of
times and then a bypass would be reasonably trivial.
You could put stamps and such on the tabs to make the job harder, but
again once the resources were focused...
In the case of your example of a OTP on a CD, simply use one of the time
release CD's that go breakdown. Assumes of course you can get them and
have the hardware to burn and seal them.
If the envelope is light-tight you could put some film in there and then
review it for exposure upon receipt (same questions of 'is this piece the
same piece that was put in there?' though).
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