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-revision-control-13.0-wheezy-i386.iso.sig gpg: Signature made Mon Oct 14 18:48:16 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 1670975ff09e244f46f5b65443f7a01845207faa * md5sum cd1d47ca91b36101771954107f83cf2b 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) iQEcBAABAgAGBQJSXDxjAAoJEIXCXpWhbrlNCN4H/1DroMlzgPFUyGdoVnQN0aQC 33Pzr8yfwnUX8qVvz2Gxt34G1+wUCp/IhCSeMp6y2d9/Uc7G/WZLaRG6YmTuGHzE QqmEr8U3Y9DnuBeVPOENtu+pGI9ii/gfqF3AWYKyjKZ3dbezoUksz8em4y8lWg2u vH0AILm+i6MqT6ADIuF0HuF2eeYL7Ww6jTeemJs2Si6nvPkbOTExFol7LR2Xibyf 8/7TNFJD0XBjoiBoe3rteKcoPAsp8M8Gl4mkWADtXrjAyH9+B057myTeVB6aSkxY ZQuOyUklERRNcE5Axt2wlSzrYrP2dRr5IAWOTXRe57jow7FA64P5P/g5M5+IAUU= =A9QI -----END PGP SIGNATURE-----