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-phpnuke-12.1-squeeze-amd64.iso.sig gpg: Signature made Wed May 1 13:22:49 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 2b4714c239ceadf3a4df77356ab430f4510dd91c * md5sum d51c106135ed59852f123c6ef8293cfa 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 v1.4.10 (GNU/Linux) iQEcBAABAgAGBQJRgRcgAAoJEIXCXpWhbrlNa1EH/3oj0klYrov6c1M87tqV2Gpm +u5l2e2Z4q9aVZGfLBwrPxWPtbGWuQbJIc9TNCTPooJt6q3ZKhleJhrs3xgYnAEQ C/1JVPzUYpwOCsAaGnaNRRqqXDZKhgGYzqTEkVNatIreC0/2ff67i1oBybim6+ZZ WnloH0+XGrQAddlyR4ESSUcJkRtwIn2ilpniKAzmSox8PRRueLc2GHpYMSmMYU5z hxURxcHZ513J8vhiMoZmXWgwJehFSjEXNFoEUaW//K2Gx/sZLcMzYQxAlMLXo/pM OUjpDqSlGLQ0fGUwCvVkZXrKlY1ChLYEzBvL/JtAWPqvLhzAzg/L+ZaltstJD8E= =WmVV -----END PGP SIGNATURE-----