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-typo3-13.0rc2-wheezy-amd64.iso.sig gpg: Signature made Wed Aug 7 09:18:07 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 2a129ba62df198d7b43516be15d304d17f370b4d * md5sum 657267c627c50b1f3e30585e10bcb1aa 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) iQEcBAABAgAGBQJSAhDFAAoJEIXCXpWhbrlNF00H/RcClMXeY8VubnpbMEzoEgvC AQKT64psHvrzmIiGWBDLdMcDk5uq6aKU6UwZzz0insA5J45p++7ThNQG2gcp4HXY Bt2w435dsJVJTBt8PQLUIsIABAwBzlvMy77zLWULG9hAanqx+DO3dlg23E5NChn4 TSicmuCnxIIHP5X/eumYtyUiE1Am4AbPd8wao4A0PM5bcspvWzUj99aObGHJ+wi1 1yXDdlnV4fuK30nNtfK8XHPbsQrTKJz1iJucy3vbPSw0auZkL9Lpg+6fahpbF5Xm KniNDmlZXakLfXrP0OBYpdowrpaumO0GrtxPSWqCF2Gjczv1QQAi+mJVL4fLQnY= =14Tw -----END PGP SIGNATURE-----