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-13.0-wheezy-amd64.iso.sig gpg: Signature made Tue Oct 15 15:36:05 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum eb263312392b98d4910ee2456edcdd29e4b6ae10 * md5sum c07101110aa3fddfafdd845d07d1be2d 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) iQEcBAABAgAGBQJSXWDcAAoJEIXCXpWhbrlNOucH/R9xT9OMoACMPJhC2JN/naAf wz2cY6Y8N1ubdu4jDXi/k0T4H7DHoDyyjXUuIZ+yhkk/lokUgibBgnXpYIzq/TTb ZdeEsxQpxmk6L9fSJn5js/DGkUDGxdpA8fxcywZBgvWgLWD15G3jiE1q5RrEDgiG gHyG+UsZJ8sJtdg1y7I/u5Q7h9diDuG1G6t3xmWjPoGl+0igOSky5YUytYUuh9WM izWJDcy8KWdKtQPGd1oWYGjsGeKUHCVKG0HSiCZdCtPIeZ+lKoKU8EjVDDMycmCV 6ezDAbKAzEQus41p9B1C88WIG9S2oRLMH8cEHBHNpF6O+ewvo6D4Spx9VydkkWw= =w94N -----END PGP SIGNATURE-----