In article ,
says...
Eric Greenwell wrote:

Perhaps I am a very special person, but I think I could remove and
replace the typical lead seal on a barograph unknown to the OO, but I
don't know how to fake an IGC file from an approved flight recorder that
would pass the verification test.

But now that you've got the seal removed, you're not done.
You have to make a fake baro trace (something that has been
detected in the past) and a fake set of photos (something
that has also been detected before). In fact, I believe the
details of an analog baro and photo set are harder to fake
and easier to detect as fake than a bunch of digital
numbers.

I was responding to a comment that said:

"Replacing a proper seal as used on smokey barographs,
if all the rules are followed, is infinitely more difficult
than decoding and faking a computer file."

And the context was about sealing a COTS GPS in a lunch box, so I
addressed only the sealing.

I haven't thought it through carefully, but I still think I could make a
fake barogram and photos more easily than a file that could pass a IGC
verification program. Neither effort might make it past the OO.
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Eric Greenwell USA