On Thu, 26 Aug 2010 08:25:25 -0700, Darryl Ramm wrote:

Yes. Anybody with the private key can sit at their computer make up an
entirely fake flight or edit an existing flight (e.g. take out a
restricted airspace incursion) and resign the IGC file and nobody would
be able to tell.


I don't think this runs as an argument. The downloaded file is, as far as
I understand it, signed by the "logger", rather than by the downloader's
computer, which makes checking for "fiddling" quite easy.

The developers can invent any key-pair they choose. The keys used in the
instrument will have been be hard-coded, therefore the private key is
already in the user's possession, even though hard, if not impossible(!?)
to read...

Potential cheats would need some considerable technical skill as well as
criminal(?) intent. Do such people fly gliders?

--
Alex