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-projectpier-13.0rc3-wheezy-amd64.iso.sig gpg: Signature made Fri Sep 13 09:03:23 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 934fdbc3db0d7cfc18d3975378bc466dce30855a * md5sum 0ba9b2003c20955d84107bce8ad08a4a 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) iQEcBAABAgAGBQJSMtTTAAoJEIXCXpWhbrlN/xcH/10MO32UoJFuXUpeh6domaC8 c3kbaaA59PWHEeFSbppHnoCAIuOK87aE6M5Y2chd/oa9O12XnW6Lu8cjLGNdzzDY OQradYru7/PmWo1nhuHzWzkp8jv/4F9LCUw2majURZGD47Y6/018tzm57MPod/q8 s+yQD3/bZTv3f/kpbdhRoZldgDAE9tYdXaivwmD1c3P3U+yt1T+KAVwovG5rGqFt e1otYyJqbJxmCscu0Yu4R3/tScEucCoxBTvLRlS2tr9FkWeIkZK4XZtJxN5aJynw hy8JEeKEg6N5ch5eSX9v0C+G1nm3mz7rPbO++/NtJNCeHJVCPbpZvrWDUqxpC6g= =ws+C -----END PGP SIGNATURE-----