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-magento-13.0rc3-wheezy-amd64.iso.sig gpg: Signature made Fri Sep 13 08:18:08 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum ad452adcc9bf16fc38693aeff56c636207996c8a * md5sum 94df8b74453e5433b27014976ad9b079 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) iQEcBAABAgAGBQJSMso4AAoJEIXCXpWhbrlNDF0H/3YZ0m5D86SUToBRPVGCvImI 7OxYCBSKTSdN+y0pi2ViERmznHQfdCdt13r/aT1VHoIBKpxTYU8DcEeJHztiF3xa w42fwyFykqMJYqEgaQA0o8b+qcmkfwg3hNnA1csjLbun2QFE26iOAtSEnHGcxl5B RNlQCOSjWE8e5c0/X0v5JYlEmPWLdVG5coVTZO7kxmuMCpZeyDEX9R8d7RwKlUcz +8TiudsXLbTFM5eFxmNGuA6yM3fowlot9pxV7YOiseeRjyhxIY663hYvuwLCXWPV eMFFYP8UfX8fij9Fl1o5Qz5r8Dd3StSSL4m5RVtoVeOrn9GJpT/7hxSOQVF83lk= =KsC/ -----END PGP SIGNATURE-----