David Kinsell wrote:
Ian Strachan wrote:

The alteration even of only one character in the flight data will cause
the Validation check to fail.


Tried to respond to this before, apparently didn't make it out.

The Cambridge models 10, 20, and 25 have no capability of producing
a valid IGC file, and no validation programs exist for them. You
can alter one of those (pseudo-)IGC files all you want, it won't
be detected. Even if you don't own one of these things, you could
fabricate a flight trace, label it as coming from one of them, and
make it look authentic.

Since we know those recorders don't produce IGC files, won't we
immediately realize they aren't authentic IGC files, but only "IGC
format files"? For example, the OLC uses "IGC format files" from
Cambridge recorders for their purposes, but only after verifying the
security of the recorder's file in proprietary Cambridge format.

Kinda kills the idea of IGC being a universal,
secure format, doesn't it?

I don't think so. The fake files are easily determined to be fake simply
by looking at the file (no fancy verification program needed), so what's
the problem?


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Eric Greenwell
Washington State
USA