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-icescrum-12.0-squeeze-x86.iso.sig gpg: Signature made Sat Aug 18 17:10:29 UTC 2012 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key For your convenience we also include file checksums: * sha1sum c29e01d8ea8c2c265547305e19f01b7479829d11 * md5sum 7128b407ee0a24f9f5b16e2011eb8a1f 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) iQEcBAABAgAGBQJQL8xxAAoJEIXCXpWhbrlNdGkIAM9YDQsLDrc5w1MVf6uhGpCt aOAmPsbexS5pgTjJb9gwjtEkXP4WBYIKM9j05cOpJgGIRDVnwt+BRmkiIMKUhg89 rq59/d1pN90MX/nv96V4mPUCB0sv7/Nuq66U+l3Fn6DvKCJHn2Vjq71WuNOTOUye CMJ5gP4eljJkyoNGRH1NQuEpwdhvuqAjTlvFiaYmcX/5uFITof7i/ew4xcBaRTzo 0zzw0pAuk9OFCHF6nmWUas4d9tofsLyopP60wn+GmuTQ5DCBD0Ee64TLwyjGTDbD qmKDf7/Cxx+dUu6Vk/rTKbo+So0gs6fd4mnNRnKLfBYXoegaYk9m/7uKoWgMKMU= =vGhZ -----END PGP SIGNATURE-----