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 v1.4.6 (GNU/Linux) iD8DBQBFnsp+qesEzEdeXBERAnnoAJ0bJujc6wHVqdXxpb+aoqf1pqgp3wCdGyKv 2vE4FH0sRWkEtUCYLMh8cWA= =XpPC -----END PGP SIGNATURE-----
You can save this signature in a text file (e.g. xchm-1.10-i486-1gds.tgz.asc) in the same directory where the package file (xchm-1.10-i486-1gds.tgz) resides and you can verify it by issuing the following command:
gpg --verify xchm-1.10-i486-1gds.tgz.asc
NOTE: You need to import the public key of SlackPack first:
gpg --import KEY