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-tracks-12.0-squeeze-x86.iso.sig gpg: Signature made Sat Aug 18 18:20:29 UTC 2012 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key For your convenience we also include file checksums: * sha1sum 70315aedd28ba7e2060923c1fd8562e86c81376a * md5sum d99825980923c9573ef3e17d55f9f589 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 v1.4.10 (GNU/Linux) iQEcBAABAgAGBQJQL9zfAAoJEIXCXpWhbrlNgaEH/3x1JY8v0GloEyqTt+qrZhNg 6bkHKTI4mjmojnLa/bln8Dgvsqa8kxv9Ae7b6HfCgiOx/cimuvRbqP2yakNMpDAV vIntvpxe4STHBlI2R7c4QuUePjy4DafgQvp3SY5KcMPjjry5xSmdxawqipX2n3H+ FPlT2dT7hl1zMd+zXM59jWQTlMCsJpB7ywA7vr26rpuPQwP//YM8sXBjZX7kuESZ 4S6xpvAA/NnflcocSZvCZ3qSs7xUnqzqRweDysZTd/441Nz0q6IbNyKschagAKWr KzzOMFLYRLzqQVfq8IG6EJATcXqfO5qa6xqz97FWsujEz0ZLnSmBcIKDIJhPx00= =An3a -----END PGP SIGNATURE-----