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-plone-13.0rc2-wheezy-amd64.iso.sig gpg: Signature made Wed Aug 7 09:00:29 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum b9aeaabff104e2d9590410cbbb11a51017cd297c * md5sum 890147dc61d84fd2124f339eb2828c6f 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) iQEcBAABAgAGBQJSAgyhAAoJEIXCXpWhbrlNjCsH/i5RM8tyxFlCfZfN3gtf97KL glLtgOXpeiIT6QQ1F4NpKpoD6o5iZjJ6rNdov7xuPQ7HOHP1Ya55wmrjoN6aJT60 1RKdiHnXRuWcGhDFkOdYDYkfoF4Wk60QXx3rxrMiLtDYj5SszBT0i81beA+OuCnd weQdvEbqJBE5MdDaj55ur6c/HPDUNeRSRRMVS0dixk17QyNTJzkUM34tS+718S2b LCnXDtR9NX6UDxWjb1RE5D+mH25pPOCjhV8gEFVEcDz8rOcRcfZqC8yNXcYQE8AR 9f3OqZFUAooDlaTXHryVrQ0d42h/uFGoJOiDWSQzRiFRmwiSXK0Btz2Z0pa+Q9c= =hZb2 -----END PGP SIGNATURE-----