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-sugarcrm-12.1-squeeze-amd64.iso.sig gpg: Signature made Wed May 1 13:52:38 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum e69556a0dcc1b9f6dc92334980c53c635e0c32da * md5sum 623c9b942ea0d9fbe5f544ecd6081e51 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) iQEcBAABAgAGBQJRgR4cAAoJEIXCXpWhbrlN4uIH/AlDe3hwPakOpz1Q5S4LuLA4 5UtDxTJn2YxeOdyTDh8bZZiC5xtskUJ8o825VtR2tfvVnrRWrPDRq9zGSaFATjlq RFvc1LjaBg1x4RyiXgLJYj0UL86iPgqDunK56fthJGxOv51S+oo20UlCgFzKeIlF f+GChbXzRJi1RxIXIzvJVAnregM9c6aKekyTs6NpWp9EkR6PTc6udqLUZOnNvQSq n9nD91JDZHLT48QWNssMj9TxHt7Wnj6mMycMokUspjMWHCgc2XXBkAsYQ7U4NYZc PAWlVu4AjvW/uR8jCBXJ087a4Gt9TI+tG86CNBy7xP/6cAxKsi2sZQ2IkGLs3JY= =NLZ+ -----END PGP SIGNATURE-----