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-tomcat-12.0-squeeze-x86.iso.sig gpg: Signature made Sat Aug 18 18:15:18 UTC 2012 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key For your convenience we also include file checksums: * sha1sum 41cc1293d4472d76ef87bc2c86d90dd04c6377c9 * md5sum ede0f13857f5c6ee283348d0330981aa 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) iQEcBAABAgAGBQJQL9upAAoJEIXCXpWhbrlNsowIAMEtaCJon5y04/RWjBp3Zz3d WByGk8s4AZuyOCBIcV9/GE5fPFyrzdOCmqq3aaK+cjquX7AdoRuwVlhi766eY+bt fTifKo4l3rmuMMvcz5szFbpEfCxaJtU1RksCjhA/0Fs89Ad4itHDqD3T71eyDAdX /VvcAlWTrnAS3/1b+m+aIydXwIUYQjFTCShOhETGFE3Nt/+4ypLcPEaaqspy3b2e JSnskTibsxxEvv+RqwwFVJfftQc51+xf9qLPLwVVmn8m8F5RX7CHRc2mBBUB/BTH RU7fOszUZraneI3pq6cqt7U+Dfvrzvn6Je2TCgkqxdwLNsvOJ1SaBLpPQEUNClo= =X4Kg -----END PGP SIGNATURE-----