It's from hostid command. How exactly is it generated I really don't know
their info page is a bit vague.
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For example, here's what it prints on one system I use:
$ hostid
1bac013d
On that system, the 32-bit quantity happens to be closely related to
the system's Internet address, but that isn't always the case.
An exit status of zero indicates success, and a nonzero value
indicates failure.
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You could always generate your own md5 number from your own specifications
for a custom facter variable. It won't be easy for you to reference the
files though. Security via obscurity isn't the best way, but it's better
than what's place now. Puppet assumes all hosts are 'friendly'
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