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-typo3-12.1-squeeze-i386-vmdk.zip.sig gpg: Signature made Wed Jun 5 00:58:17 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 456f9e986da256bb75b1a6421aacef857a9d61f7 * md5sum 41cdd4062a781af99939e177e48be703 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) iQEcBAABAgAGBQJRro0XAAoJEIXCXpWhbrlN5TUH/iB04FS7sFOsyIw6aOsfy07S rQeGz/saOXxZJnbc5OAOttgRSKqt+orB9ziFp2DeRAZOKnLjcjKP8UFrjbua8Bo7 gFY9A/z84a+0wO4mJEW7egtmyWCsUvCJBy9TJns0V1aXpi+k3n0iliydfCMkLblK biuftUYsSNjMFCsCL9lrZbzsS/ben6/ufO/l6CHj9YWNq30852yK6dpRIj7LIU/2 LHV7f2BuvnlVA8fp0VnsoZPaj2vEZN+vk9ezbBwh55FbCotTG4zcSS0JfAr7THdk jgDFpGtsqqcXDPin8DjJd4Inpe0NYX3jYy/K9yXRqaUcz+3yZ1g8Gehzc4ZEctg= =isq8 -----END PGP SIGNATURE-----