TBH I can't see the point of rolling out the validation software to anyone other than DIY orgs and the AAA Man;
Oh I agree, but I disagree with the idea that it must be kept utterly secret just in case, if it does get into the wild, it somehow makes it any easier for people to cheat (especially in the long term).
To put it another way, it would be impossible to produce a system that was completely impossible to fool. There will always be a way of producing a likely looking GPX file by hand (such as gluing together bits from rides done over several days for example and adjusting the dates).
But the amount of effort required to produce distinct plausible fakes time and time again is much more work than it is to get in your car (or train) and cheat your way round an existing DIY/Perms.
Only if you hand-craft the gpx file every time. It obviously opens up the whole "but why would you want to cheat" debate, but you could write a piece of software to produce a 'realistic' GPX file. One way that comes to mind would be to plot a small section of the route (or
any route), then ride that small route, compare the two to produce a randomisation (or "realisticisation") heuristic, then extrapolate that to apply to the whole route. With a bit of fine tuning it's not long before you've essentially got something into which you can feed in a bikehike plotted gpx route at one end, and get a 'realistic' tracklog output at the other.
Once you've got that set up, it strikes me as a lot
less work than cheating by driving.
It may be that the gps checking software could be beefed up to spot this, but you have effectively then
started an arms race, and you wouldn't want to have the checking software produce false negatives as that really would piss people off.
It has to be said though that the whole of the above is purely a thought experiment on the intricacies that the desire for gps validation throws up.
As has been said, there
really is absolutely no point. I'm almost of the viewpoint that cheating is not only pointless, but
so pointless that it essentially renders going to a lot of effort to prevent it slightly pointless, as well - but i'm aware that if that policy was based on that opinion then it may have undesirable consequences. As it happens i think auk strikes a good balance.