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-fileserver-13.0-wheezy-i386.iso.sig gpg: Signature made Mon Oct 14 17:38:32 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum e11caf5cc0bd085b3763de920b164a66253501dc * md5sum f8f08f35b783598da7ce88e57201f0fc 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) iQEcBAABAgAGBQJSXCwMAAoJEIXCXpWhbrlNqiMH/0r2o+98l2uBmpwM8voAdNdB KxvWJKt8fV1w7z5IxizQDILXzB4kSACWrxwz/vMmZRGgVAcCFGz82kZfZyLIiAC9 Z50hxfHXJzCQAnT1pv+5VyRXVGY/CSOSRNTkHWM2s6MOqHQwRvuaPPeSQnAbneJs qXHdVmKbV7Xrm81KD1//AQrhSEdWmZ1U3LbkyrTffwdwxqdZLxLdwEGpLiiMJPCc 5J7t0PN5CRayJMHfVpWHQinIvaGY3yYRS4U/MSJpJ3CKFY0bDN0G+9aTR2smfufj tGm0qMRFzlCXSnjT9rjoV1tCQMPtEE9oCRDe+wE/tajNY14jZvxvsOx1Qo2panc= =9Zec -----END PGP SIGNATURE-----