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-movabletype-13.0-wheezy-i386.iso.sig gpg: Signature made Mon Oct 14 18:16:19 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 886041da0a61c606f34c739f7b9b34abfff84049 * md5sum c804212b24522524822b99dad8b8718b 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) iQEcBAABAgAGBQJSXDTnAAoJEIXCXpWhbrlNgn0H/0Yv8NDBHwfJ3DZK9HKR0gJj NpZl/rRvfE5kWjhmOLuFpaLxX7aZezShtOaNIW8aiMH4j+S90Lxw/di7V7WqDJr4 XZa73pR2iPZW5ZDVmXaZ1G59UfniO1LtfVWVVuoyezd/wzLrbhs4fL7S7zYBF0UH fHlY/nkzn/+Bf+wruUDDeLSUWEgozHsCAdGnFUq9eikm2ckFOc2T0zX6SQGvC/d4 LvWhBWkyJ9uNhhCc/Bzv5LVSP6NypAnCmoRwv6SkR+vppT6RdUqvWhDDBQ7NeUlE JGCvk/NasPZiJmH+Sx2xYxJIo1TS/GczIc81XQc5wN+DdV8rjjS/fZRoRoJ8xZo= =eQUb -----END PGP SIGNATURE-----