There is a pgp signature on ripe.net:
https://www.ripe.net/projects/disi//keys/ripe-ncc-dnssec-keys-new.txt
https://www.ripe.net/projects/disi//keys/ripe-ncc-dnssec-keys-new.txt.asc
(this has apparently been made with gpg-1.4.1)
All versions of gpg i tried it with gave me a 'Good Signature', except gpg-1.4.8
(which is the current default on freebsd).
I have not been able to reproduce this problem with my own keys.