db4 Upgrade

[Carlos Arturo Trujillo Silva]

Hi,

I'm updrading db4 with apt-get, buy when finish resolv the dependecies
the follow it's showed.

***************
Unknown signature
/var/cache/apt/archives/rsync_2.5.7-2.legacy.9_i386.rpm: (SHA1) DSA
sha1 md5 (GPG) NOT OK (MISSING KEYS: GPG#731002fa)
E: Error: 0 unsigned packages
26 unknown signatures
0 illegal/corrupted signatures
***************

And no upgrade.  why?
I use Red Hat 9, 
-- 
Gracias.
Atentamente,
Carlos Arturo Trujillo Silva
Ingeniero de Sistemas