This should help, scroll down to the heading " How to deal with digital signatures signing RPM packages"
http://qa.mandrakesoft.com/twiki/bin...ndrakeLinuxFAQ
The last line in this article reads "If urpmi suddenly begins to barf about invalid signatures, first check in your /etc/urpmi/urpmi.cfg config file that the key id for the media is the correct one. If this is not the case, just delete the key id."
- In looking at my key id's I see the "key id" line is missing and replaced with the line "ignore" without quotes, (This is on Thac's repository, and i don't get errors with downloading them)