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-simpleinvoices-13.0-wheezy-amd64-ovf.zip.sig gpg: Signature made Wed Oct 16 10:04:15 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 2aab4f8ca96814051f5449403110a747219c061e * md5sum 599b98c67d5a396af12b9accd34a88e1 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) iQEcBAABAgAGBQJSXmSUAAoJEIXCXpWhbrlNMuEH/2LEjBj5KA/yrDyczgS5v8Cu QEc1T4KBRr0bDN143VwZJevbTEh6TQCzIb70edgh2Ex23KEnRNz5ghyuHXXk0zt9 MCaMOQ+NziaeM+ZRXQ0ggfV7cOtdic2g+udTI5MGDgqH7c2PnatMDB98T0rRsSIo jPxk9jgPFMQ7UL3IrJLa/viWqKk47cbbMh7c+x8QBusCQlARZ9Hax/F9K3sUBlqz 10g3JMCgpVZz5n20TsSznnYCuJ4oh9oScfQgLsa4Gv3ywt8LCdbcY4QDHMpkV2NQ 8hsKcq9aJBQVqRSCtIWzey9gJk+kk24n9TIKIRG+729lY4NVbqEhutw9KGxEQps= =c6Vb -----END PGP SIGNATURE-----