On Mar 29, 6:59 pm, CharlesHarrison <[email protected]>
wrote:
> If it isn't stored anywhere, how do they check it's the correct one?
> On the page where you sign up for one, it suggests that the key is
> linked to and associated with your Google account:

It is. The key is a hash of account details and the URL for which it
was generated, but it doesn't have to be stored anywhere. The Google
account can presumably be reverse-engineered from the key so that
banned accounts can be denied; and the URL is only there to check that
it matches the URL of the page which uses the key (in which case that
only has to be one-way encryption). The key holds its own data.

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