This is the package signature as generated by The GnuPG. This signature identifies the party that created the package. By verifying it you are sure that the package coming from a trustworty person or organization.
Here is the package signature:
-----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) iEYEABECAAYFAk1yCNgACgkQqesEzEdeXBH+mgCdHkRcXPUnZ3lQk/Dd5nt0WWP3 22UAnRBxuhTqxR0tkN1tIUb4kwaV4WyJ =v+F1 -----END PGP SIGNATURE-----
You can save this signature in a text file (e.g. firefox-3.5.17bg-i686-1gds.tgz.asc) in the same directory where the package file (firefox-3.5.17bg-i686-1gds.tgz) resides and you can verify it by issuing the following command:
gpg --verify firefox-3.5.17bg-i686-1gds.tgz.asc
NOTE: You need to import the public key of SlackPack first:
gpg --import KEY