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 v1.4.9 (GNU/Linux) iEYEABECAAYFAkrnC5YACgkQqesEzEdeXBFuawCgh57P96qD1+I8bD/eJwg7doCT ve4AoKB/ubx0VOEwQ1tnZ1iIwXX2J3d3 =8BeK -----END PGP SIGNATURE-----
You can save this signature in a text file (e.g. libtool-2.2.6a-i486-2gds.txz.asc) in the same directory where the package file (libtool-2.2.6a-i486-2gds.txz) resides and you can verify it by issuing the following command:
gpg --verify libtool-2.2.6a-i486-2gds.txz.asc
NOTE: You need to import the public key of SlackPack first:
gpg --import KEY