It is strongly recommended that you verify the PGP signature for any source file before installing it. Even if you're not downloading from a mirror site, verifying PGP signatures should be a standard reflex. Many people today use the GNU GPG tool set in place of PGP. GPG can substitute for PGP.

With that said, go ahead and download the following files:

$ 

wget https://us1.samba.org/samba/ftp/samba-3.0.20.tar.asc

$ 

wget https://us1.samba.org/samba/ftp/samba-pubkey.asc

The first file is the PGP signature for the Samba source file; the other is the Samba public PGP key itself. Import the public PGP key with:

$ 

gpg --import samba-pubkey.asc

and verify the Samba source code integrity with:

$ 

gzip -d samba-3.0.20.tar.gz

$ 

gpg --verify samba-3.0.20.tar.asc

If you receive a message like, “Good signature from Samba Distribution Verification Key...,” then all is well. The warnings about trust relationships can be ignored. An example of what you would not want to see would be:

gpg: BAD signature from “Samba Distribution Verification Key”