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-collabtive-13.0-wheezy-amd64-ovf.zip.sig gpg: Signature made Wed Oct 16 08:12:47 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 7731770779ba2b9bcc51d67fc1a2df824a0043fa * md5sum d52263b0d5f3374a8892800e6d9c4afe 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) iQEcBAABAgAGBQJSXkp1AAoJEIXCXpWhbrlNS4sIAN8HnAmYdbKBKPa985B1gQP4 JohTIOHZsKc9Ej3Lm1PWQCgEYbTT40GgY3fIQvdue0KCrKOSCKU+ntUy7UK26yer KbQbLxAo1ua48BEi6wvlJ6IKR86sQ5MZL+Nahadtb6DAHpzP7V4o1SQaUzaXasyj Hv0L8f5r16AoFlJW5BNuC0OOPSCwOUT/vVXR4tBLUuOVlbxOQbBkdoai2BvqVk01 Iurl7oj4VZqgByUekaQm50sU4elyTHuG9kOf5OpUu0P3KmEcMA5xC+CbvL0qOgE9 Xp2dpeZuWwJ/02wMsIoFQthbICrOLJBQpS7asgdPWWVzbmnJw1N2PhzbOTFRGxE= =nnpp -----END PGP SIGNATURE-----