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-cakephp-13.0rc2-wheezy-amd64.iso.sig gpg: Signature made Wed Aug 7 07:33:50 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 49f72dbd4d41f385f79b07cbecf5a65a7b64bf1f * md5sum 47ac939c2bf5f964b33e2a7364f753a6 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) iQEcBAABAgAGBQJSAfhSAAoJEIXCXpWhbrlN3cgH/0zHcbnNo0jpyESiBkuE0KyB Mi+hg+vQkyKh0MOt6BesQTKT9pwRDjPTaD2c6FU86aLTaKew1DrRSAlQhN2sR3WJ PsHR6rGISQPMvJysqbaNW+MBqMh48aQi78UX1RP8gQ3tjXvQwlykZT7l3S6JYQpj hgpFT7nYKTc+vUjQlT13YgAb+LMgWMC6bQ79QsjjInn34mW7hdxOY1xOf2DQiHpr wqELPVCeNMxDIIRLCKNNYRQ0ics3PIrdKkEdqozW3Lpln+60XkV65EknxipEOMyP n7MwKABdjqJcwP2Rrx8N3CAhSGsbiFmXgOIDQ/CMq8YQ/YpXPXhA/6UikcsY8Hg= =bMNK -----END PGP SIGNATURE-----