I have never used a lead seal, I have used sticky paper
tape signed over the join. I would far rather use the
power of my computer over unlimited time than try and
unstick and restick in exactly the same place while
the baro is still in the glider. Remember the OO seals
the baro and witnesses it's placement in the glider
and it's removal. I am not saying it cannot be done,
what I am saying is that it cannot be done in the time
available. Security buys time, that is all it does.
Time, as far as a digital file is concerned, remember
that it is just a series of 0s and 1s, is unlimited.
As far as personally faking a file, I may not have
that skill, I know an 12 year old next door who does
though.

At 20:30 02 June 2004, Eric Greenwell wrote:
Don Johnstone wrote:

A GPS sealed in a box is as secure, if not more so
than a smokey barograph. It is many more times secure
as a computer file produced by a 'secure' logger,
the
security algorithums of which are historically interesting,
almost. The information contained in the GPS memory
is raw source data, that produced by the logger is
not. 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.


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.
--


Eric Greenwell
Washington State
USA