This signature file may be used to cryptographically verify file integrity, like this:: $ gpg --keyserver hkp://keyserver.ubuntu.com --recv-keys 0xA16EB94D $ gpg --list-keys 0xA16EB94D pub 2048R/A16EB94D 2008-08-15 [expires: 2023-08-12] uid Turnkey Linux Release Key $ gpg --verify turnkey-processmaker-13.0rc3-wheezy-amd64.iso.sig gpg: Signature made Fri Sep 13 09:04:59 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 271a2e75ee3795dcc41adaa3f6ad1e7a5cd463d4 * md5sum ed148bce2979109688be3d1fe494b8cf You can calculate these on your end and compare to check for errors, but cryptographic verification is recommended for security reasons. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAABAgAGBQJSMtUzAAoJEIXCXpWhbrlNPP0IAI0RE3JVIVDaH3bQC2wNUSwV 4fvO+AIXzCkvpcTH4FQDC7HdA8u9KGAv1v1mwip0yxZfykIznMgvLwFSNjYlQLbY V0q7k9Z+IDzE1Bfga74Vp1wbr2ItCN4ALvi5+rwftly1pvvir44qQi7/EoPjx/rB CFQvMCKLoEctYBSj5F2AEo9eXED8eZo7OZdnQVNcH2QnYP9uTOrlCOMhPvdLm5fc gpdUTvY34HHBzLLXxDauzwFVFMOFD2BW52cC+YVnq1aIk6KVWLefSaHvk3h6dyF9 PI8NOHRuf8Mx9UD/W9GovCDsh59TAmIizfUlePH9Kl5U7BL6oEBoaBbHKAyMpYM= =57rh -----END PGP SIGNATURE-----