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-zurmo-13.0rc3-wheezy-amd64.iso.sig gpg: Signature made Fri Sep 13 09:52:04 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum ad8f3e0f4b2cc2b8dc6563e6ce50991603b0923d * md5sum a263c260aed1aeaaf4eedbadca13dbb1 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) iQEcBAABAgAGBQJSMuA8AAoJEIXCXpWhbrlNBtcH/AgBq92LzeZNAASVzl8K1J6x hm+Tc6VhCqSzW10PbwvdtLLx1RUEvS+Xbd+avkrM0BVUEWtlEh3l9z421zz0AQny WmhyFtSOoHDMOy+YfbrKWKhHa84jUpAF/NI0M8AzuTkG4y4uw7YFgvJV/V/87bDU YMOpErBYJpwoP82dRlL5cmVNb9qflDk2ODNQP7ngDD/iD/WOMaQ7mV4MVk10s8YY UFl2jVbW3lfKqM8xrpOJMd7bQP21uYoWl0gb8ZxKGQGLoqfD0SPO3a/irLQFnH+3 URxFCEEsvgeBRibciiYDR1jSzG9DCGpDgHxvxg9wGWPxvpv6ZKyV9Zcf9tftmB0= =bQwP -----END PGP SIGNATURE-----