Generated via:
% gpg --gen-key
% gpg --output keyrings/grml-archive.gpg --export 0xEA2EA4AB 0xECDEA787 --ascii --export-options=export-minimal
while 0xECDEA787 is the old, existing key
and 0xEA2EA4AB is the newly created one.
Updated md5sums.txt via:
% md5sum keyrings/grml-archive.gpg > md5sums.txt
% gpg --clearsign md5sums.txt
% mv md5sums.txt.asc md5sums.txt