For those of us Noobs, and for the purposes of education and security, how can we check the the Signed Message? I have GPG on my computer and only know how to check a .sig file as Canton showed on his site.
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Easiest for me (using KGpg): Import the public key, copy the whole message text to the clipboard, select "Sign/Verify Clipboard":
Good signature from:
ninja
Key ID: 527B5C82B1F6B2DB72A0ECBF87497B9163974F5A
The signature was created at Friday, October 25, 2013 05:57:16 AM
The signature is valid, but the key is untrusted