In my day job I do a bit of IT. We normally balance
risk of the outcome with reward when we talk of security.

Question - who in gliding is going to make a killing
from faking a GNSS log.

It really has to be 'just secure enough' to balance
the risk/reward question. I don't know anyone who is
going to become rich from declaring (and passing) a
new world record.

In reality, does the common gliding herd really mind
if someone fakes it. Who are GFAC/IGC protecting ?

If IGC suspect that someone has been cheating (remember
that they used to cheat with cameras) just refuse to
ratify the claim.

John