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