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-punbb-13.0rc2-wheezy-amd64.iso.sig gpg: Signature made Wed Aug 7 08:49:11 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 0d13cdd0f243033092e1e91deed2305645f199ec * md5sum a4ecf44c12e85089e81112994db95ac2 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) iQEcBAABAgAGBQJSAgn+AAoJEIXCXpWhbrlN9V8IAL9oYTjmdft4xhV45XA2pe80 QqYl7Cm6c008XaSwUJaK+/G0cBgzNPVfxHWOybJWPGcjBRncGDE7yBqXaMhvCbKP 4P8T6wOdTxLatle2a/AS/TmOsD2qUe1rZmzf6iCtomJdYy+8BgRY5op0N38QN8tk Q4145aH3UQiRP0BYyyCdrlAn7urEu+NwMzyXzLgC7Jtn7qbFYRJ+VeTYxjKJ7f6L /vaNzmrjfekBOf4H9V2VxQbqCLKR65C7mcasa2wt1iY/yv5EuE8bWAFNKRA6gDXN VBPl7km4P0kVyZq0BXfExuqcyskOV8EWd/YRid9DvJsrQradipkDFhMPlxMw728= =byib -----END PGP SIGNATURE-----