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-lighttpd-php-fastcgi-13.0rc3-wheezy-amd64.iso.sig gpg: Signature made Fri Sep 13 08:14:43 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 34ec6a958a1332cb5571b4cdfb0a46644d5b7112 * md5sum 73235664cf15c118918ad5176d1c1612 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) iQEcBAABAgAGBQJSMslsAAoJEIXCXpWhbrlNESoIAIICCXCOokT+JyE1HXE1z5HH N3E+wVsNCGFcieMSDRy2/xpzEMwDA4erdMPDikFoOICKMdLY9g/tW0fshz7a1cwq wmOY4qS67v+GgGSJV1bMw+KphRDRIztXnc6+Hkj9oXNC4bZOrhfobPRF+fs0pIfN FY4SKL3bAoxzQkW+S/aeSh17K4qLGuZCTtZ5VsSgxsTJgYYfJFBZeAizuxi0bTlp QysGXZQig/CWqaYlYWqS0yVne054XeAbrkZjO+i0bLWwz3taav78s/PDM7maj7IP j8U25wjkM/3zoUJXAc56xlxUDhU+0k4k0axZyN9MRweXbLs8weJTPIqhuQLgwNo= =G6LX -----END PGP SIGNATURE-----