setup.exe.sig not verifiable?

[Patrick Strasser <patrick dot strasser at tugraz dot at>]

Hello list!

I saw on the install page[1] that you can check the validity of the
setup.exe with the provided signature file and PGP keyring. Great!

Unfortunately I cannot find a trust path to the signature. It seems that
only Dave Korn signed with his key 0x6A388C3E, but his key is unsigned.
So how should I know that not all three, setup.exe, setup.exe.sig and
the keyring are tampered? Or am I missing something?

Regards

Patrick

[1] http://cygwin.com/install.html
-- 
Engineers motto: cheap, good, fast: choose any two
Patrick Strasser <patrick dot strasser at student dot tugraz dot at>
Student of Telemati_cs_, Techn. University Graz, Austria


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