[CentOS] RPM DB DSA Signature Errors

Alle,

I'm running CentOS 4.8. I just started seeing these errors during RPM operations:

error: rpmdbAdd: skipping h# 990 Header V3 DSA signature: BAD, key ID 443e1821 error: rpmdbNextIterator: skipping h# 969 Header V3 DSA signature: BAD, key ID 443e1821

I've cleared out the __db.* files and tried to rebuild the DB with no luck. I've also tried this: http://forums.fedoraforum.org/showthread.php?t=145858 and this:

cd /var/lib tar zcvf /var/preserve/rpmdb-`date +"%d%m%Y"`.tar.gz rpm cd /var/lib/rpm ls -l rm -f __db* /usr/lib/rpm/rpmdb_verify Packages rpm -qa 1> /dev/null rpm -v --rebuilddb

with no joy (also with the PubKeys). Any ideas as to what to try next would be *most* appreciated.

Best Regards, Camron