cpanp install, gpg: Can't check signature: No public key

QM has asked for the wisdom of the Perl Monks concerning the following question:

Windows XP, strawberry Perl v5.16.1

C:\WINDOWS>cpanp i Math::Big
Installing Math::Big (1.12)
gpg: Signature made 04/17/07 15:52:12 GMT Daylight Time using RSA key 
+ID 93B84C15
gpg: Can't check signature: No public key
[ERROR] Signature check failed for module 'Math::Big' -- Not trusting 
+this module, aborting install

*** Install log written to:
  C:\Documents and Settings\SG34\.cpanplus\install-logs\Math-Big-1.12-
+1348754888.log

Error installing 'Math::Big'
Problem installing one or more modules
[download]

Exactly who doesn't have a public key? The module author?

How do I fix this? I assume I should be using gpg, so I installed it and exported a key to the default server.

At this point, I'd just like to install the module.

-QM
--
Quantum Mechanics: The dreams stuff is made of

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