kernel update for 9.0

Hi List, I can't install the kernel update for 9.0. I got an error from RPM: invalid signature for the kernel k_deflt and k_athlon. rpm -Uhv k_deflt.rpm error: k_deflt.rpm: V3 DSA signature: BAD, key ID 9c800aca error: k_deflt.rpm cannot be installed Has anybody an idea. thanks Klaus