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-symfony-12.1-squeeze-amd64-ovf.zip.sig gpg: Signature made Tue Jun 4 16:22:44 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum d899289b2f6051eef384e0cb372a88286f8c7588 * md5sum ff9eb1e65cce07eecef3d836ba7add2c 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) iQEcBAABAgAGBQJRrhRJAAoJEIXCXpWhbrlNNFoH/Rm3qIzOpfsWuZDyy6WVB5CU B/7jmskpsH3uN6gvjKxqLrwCrxrT4qhTFljHT+jRwFLeeNQkZMlD/Nu/y29v22hc qGW7qs0lpJmjK/tg5dSlZs9+o/2mLBSBVxHoECWo2k5n0a+AxvefYWB/0Jp6ppwH nEuLysgOAcAv8VJ8AUH4arUj04MIStnZeT8VuFZBDFxGo1dO65xHf1ayA61Kro9Y XwgavT7nTQuDwPmtcv4acyrJbHFWteS0HcD0Cic6/3sltuPZt/W1nfyvbhCxF8U3 CjzYFFAMgzzoY2hmkRHH7OwCLz1xgMPa7ehXbGBxvu5yZP/gmKQX4GVxStSocGE= =CTr0 -----END PGP SIGNATURE-----