Yum and RPM with FC2

[Tim and Alison <home timalibentley org uk>]

I have had to rebuild my FC2 box and tried to use YUM to update the 
packages.
It has downloaded all the new RPM files but I am getting the following 
error when it tries to install the packages

error: rpmdbNextIterator: skipping h#     286 Header V3 DSA signature: 
BAD, key ID 4f2a6fd2

This happens both with YUM and if I try to use native RPM. 
On both occasions the console starts witting lost of messages like the 
one above and I need kill the console as CTRL-C fails to work.

Any ideas how this could be fixed.

Tim
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