I fixed my own problem, after searching around for a little bit. Here's what I did (all commands run from root shell):
1) temporarily disabled smart's signature checking
Code:
smart config --set rpm-check-signatures=false
2) downloaded/installed key files
Code:
smart install rpmkey*
3) re-enabled signature checking
Code:
smart config --set rpm-check-signatures=true
re-start SMART, refresh cache, and Bob's Your Uncle!
Hope this will help anyone else who experiences this same problem.
Cheers,
p22